ארכיון יומן של מרץ 2021

מרץ 24, 2021

Paper published using iNaturalist observations! Woo hoo!

Hey all! Fairly exciting -- Amanda Neill and I have published a paper using iNaturalist observations to document a 'new' species for the state. :) Here was the observation that sparked it all:
Keep an eye out for this little plant too. It's a winter annual here in north central TX, so take closer looks at those little mustards. :)

Pre-print of accepted manuscript, subject to final revision, copyright Journal of the Botanical Research Institute of Texas (https://www.brit.org/journal-botanical-research-institute-texas).
Intended citation: Neill, A.K. & S.R. Kieschnick. 2021. Noccaea perfoliata or Microthlaspi perfoliatum (Brassicaceae), new to the flora of Texas, U.S.A. J. Bot. Res. Inst. Texas 15(1). NOTICE the volume/issue of 15(1) and not 14(2).


Amanda K. Neill Sam R. Kieschnick
Botanist-at-large DFW Urban Biologist
Krum, Texas, U.S.A. Texas Parks & Wildlife Department
amanda.neill@gmail.com Dallas, Texas, U.S.A.


The nonnative plant species contentiously known as either Noccaea perfoliata or Microthlaspi perfoliatum is reported in Texas for the first time, with iNaturalist observations from Collin, Dallas, and Grayson counties.


Se reporta por primera vez para Texas con observaciones de iNaturalist de los condados de Collin, Dallas y Grayson, la especie de planta no-nativa conocida polémicamente como Noccaea perfoliata o Microthlaspi perfoliatum.

KEY WORDS: Noccaea, Microthlaspi, Coluteocarpeae, Brassicaceae, pennycress, adventive, nonnative, state record, Texas; iNaturalist.


The diminutive, herbaceous early-spring annual commonly known as claspleaf pennycress, perfoliate pennycress, or thoroughwort pennycress (Brassicaceae: Coluteocarpeae) is native to Europe, eastern Asia, and northern Africa (Al-Shehbaz 2010). Britton & Brown (1913) noted the plant’s early introduction to the western hemisphere in New York and Ontario; it is now a naturalized weed of roadsides and disturbed areas across a midsection of the eastern and central U.S., mainly from southern New England to the central Great Plains, with a few records from Washington and Idaho (iDigBio.org). The species has been recognized since the time of Linnaeus and is unquestionably distinct, but its generic placement has been tumultuous, resulting in confounding disagreement amongst currently authoritative nomenclatural resources. This creates a difficulty in crafting the appropriate announcement of its presence in the Texas flora, and compels us to discuss the nomenclatural history of the taxon prior to the details of its discovery in the state.


The species of note was long included in the large and unruly genus Thlaspi (as T. perfoliatum L.) in North American accounts (Payson 1926; Holmgren 1971; Rollins 1993). Based on morphological characters, Meyer (1973, 1979, 2003) split Thlaspi into 12 genera, using the species in question to typify the new genus Microthlaspi (as M. perfoliatum (L.) F.K. Mey.), while also resurrecting the genus Noccaea Moench. The next two decades produced a veritable spate of molecular phylogenetic studies (well-summarized by Koch and Mummenhoff (2001) and Koch and Al-Shehbaz (2004)) that asserted the unnaturalness of Thlaspi sensu lato and supported many of Meyer’s segregate generic concepts (including Noccaea), but brought into question the monophyly of Microthlaspi. In the Flora of North America (Al-Shehbaz 2010), this species was treated as the only representative of Microthlaspi, promulgating a position still held by some respected taxonomic resources (e.g., Brassibase (Koch et al. 2020)). However, Al-Shehbaz’s generic synopsis of Noccaea (2014) subsumed Microthlaspi and nine other Meyer-segregate genera and published the new combination Noccaea perfoliata (L.) Al-Shehbaz, a name now accepted by other authoritative resources (e.g., The Global Biodiversity Information Facility’s GBIF.org and Kew’s PlantsoftheWorldOnline.org). Recent tribal-scale phylogenetic studies have taken contrary (Ali et al. 2016) or equivocal (Özüdoğru et al. 2019) positions, with the latter calling for more comprehensive analyses, stating, “Although we lean, at least for now, toward supporting the position of Al-Shehbaz (2014) in accepting a broad concept for Noccaea, we believe that it may not be the final answer.”
For the purposes of this state record publication, we assert Noccaea perfoliata (L.) Al-Shehbaz is the correct name for this entity, following Al-Shehbaz (2014); however, as that name has not yet been consistently adopted across authoritative platforms, we retain the synonym Microthlaspi perfoliatum (L.) F.K. Mey. in our title, hoping to provide a fair chance to every reader and indexing service for discovery and recognition.


Claspleaf pennycress—under any of its scientific names—is absent from checklists and floras of Texas (Correll & Johnston 1970; Hatch et al. 1990; Jones et al. 1997; Diggs et al. 1999; Turner et al. 2003) and checklists of nonnative plant species in Texas (Nesom 2009; Aplaca 2010). Texas was not included in the range in Al-Shehbaz’s FNA treatment (2010) or the most recent multistate regional flora for the southeastern U.S. (Weakley 2020). Other than reproduction of the recent iNaturalist observation records we cite below in detail, the species has not been mapped as occurring in Texas by any authoritative species-mapping resource or herbarium portal, such as the PLANTS Database (USDA-NRCS 2021), BONAP.net (Kartesz 2015), iDigBio.org, Bison.USGS.gov, Explorer.Natureserve.org, EDDMaps.org, or PlantsoftheWorldOnline.org. The species has been recorded infrequently in the neighbor-states of Oklahoma, Arkansas, and Louisiana (Kartesz 2015; and according to digitized herbarium records in the TORCH and SERNEC herbarium portals), but these reported localities were not near the Texas border.
The recent appearance of claspleaf pennycress in Texas came to the attention of the first author (A.K.N.) while searching for uncommon taxon records on iNaturalist.org during Brassicaceae treatment research for the Illustrated Flora of East Texas, Vol II, in preparation by the Botanical Research Institute of Texas (BRIT) Press. iNaturalist is an immensely popular and well-curated global citizen-science biodiversity observation tool, with over 1.3 million users and more than 50 million documented observations of wild organisms (California Academy of Sciences 2020). Accessible online at iNaturalist.org or via a free stand-alone app, contribution is open to any registered user following the guidelines. Contributors document a record of organism occurrence by providing all the data one would typically expect to find on a natural history collection label, supported by one or more photographs of the organism in situ. Annotations are facilitated and encouraged; annotations in agreement can accrue to result in designation of a record’s quality as “research-grade,” and these records are shared with the Global Biodiversity Information Facility (GBIF.org). Skilled amateur and professional biologists have enriched iNaturalist with high-quality observations including precise geolocalities and high-resolution photographs, and while these lack the physical permanence of a museum-deposited voucher, they can be linked to records of such, if a sample of the organism is simultaneously obtained. Most importantly, the born-digital observation can be immediately uploaded for research use, while a physical voucher may take weeks or years to be processed, accessioned, and digitized for remote examination.
In the pandemic years of 2020–2021, every digital observation and specimen gained additional value, allowing timely research to continue, remote from the restrictions and risks of the physical world. As former staff of BRIT-SMU-VDB, one of the larger herbaria in the United States, we are compelled to affirm that the responsible collection of physical vouchers will forever remain integral to the growth and value of natural history collections and should be highly encouraged—when legality, conservation status, and population size allow it. However, many unusual records would have been long-delayed in recognition and collection (e.g., Singhurst et al. 2020) if the traditional methods of documentation were the only acceptable methods . Urban species records in particular may be passed over by professional biologists, but these are being documented more frequently by citizen scientists—by an order of magnitude, for some charismatic organisms (Spear et al. 2017).
Claspleaf pennycress was apparently first observed in Texas on 31 Jan 2019 by the second author (S.R.K., who also identified the species; Figs. 1–2), in the north-central part of the state in Grayson Co.; this occurrence was documented with precise geocoordinates and several high-resolution images in iNaturalist, where observations are assigned a unique number that forms the last segment of the permanent URL, i.e., S.R.K.’s Grayson Co. observation is #20000793 and can be viewed at: https://www.inaturalist.org/observations/20000793. A second locality was documented by S.R.K. on 4 Mar 2020 in Collin Co. (iNaturalist observation 39559646) (Figs 3–5). A third observation was made by iNaturalist contributor Annika Lindqvist on 7 Mar 2020 in Dallas Co. (iNaturalist observation 39684417). The excellent quality and resolution of the images of entire plants, racemes, flowers, and maturing fruit on iNaturalist supporting these well-documented observations were sufficient for definitive determination as the fortunately-morphologically-distinctive Noccaea perfoliata (= Microthlaspi perfoliatum); Dr. Ihsan A. Al-Shehbaz at MO viewed these records and provided his expert confirmation (pers. comm. to A.K.N.).

These observations hinted at the incipient naturalization of an adventive, exotic species in our state, providing the impetus to initially submit this note based on observations alone, unconfident in our ability to obtain reproductive vouchers of this ephemeral spring annual between the continuing COVID pandemic and the enthusiastic mowing schedules apparent at two of the localities. Thankfully, we were able to return to the Collin Co. location in Mar 2021 and obtain a set of specimens for distribution by BRIT-SMU-VDB.

Herbarium voucher: U.S.A. TEXAS. Collin Co.: Lavon, Mallard Park, W of TX-78, S of park/lake access road, just E of path to rest area, 33.048415°, -96.425459°, accuracy 2 m, large population in flower and fruit, on regularly mown roadbank, in full sun, on sandy soil; with Sherardia arvensis, Medicago, Oxalis, 12 Mar 2021, S.R. Kieschnick & A.K. Neill 1751 (BRIT); Sam Kieschnick (sambiology) iNaturalist observation 71085243 (https://www.inaturalist.org/observations/71085243).

Digital vouchers [additional locality and habitat data interpreted by A.K.N. inserted in brackets]: U.S.A. TEXAS. Collin Co.: Lavon [Mallard Park], 33.048415°, -96.425459°, accuracy 6 m, [with Medicago, Trifolium, Anemone, Veronica], 4 Mar 2020, S.R. Kieschnick (sambiology) iNaturalist observation 39559646 (https://www.inaturalist.org/observations/39559646). Lavon [Mallard Park], 33.048415°, -96.425459°, accuracy 6 m, 5 Mar 2021, A.K. Neill (aneill) iNaturalist observation 71287992 (https://www.inaturalist.org/observations/71287992).
Dallas Co.: Ferris [Parkinson Rd., S of Tenmile Creek], 32.563171°, -96.62362°, accuracy 6 m, 7 Mar 2020, Annika Lindqvist (annikaml) iNaturalist observation 39684417 (https://www.inaturalist.org/observations/39684417). Grayson Co.: Howe [Bicentennial Park, W of I-75, just S of southern baseball diamond], 33.51114°, -96.618564°, accuracy 4 m, [on regularly mown field, in full sun, at top of slope to adjacent creek drainage; with Sherardia arvensis, Soliva, other spring weeds], 31 Jan 2019, S.R. Kieschnick (sambiology) iNaturalist observation 20000793 (https://www.inaturalist.org/observations/20000793).

We encourage other botanists in the state, particularly in northeast Texas, to be alert for this species, and to document any additional populations with herbarium vouchers and concurrent iNaturalist observations. Herbarium searches may uncover other records in the state. Specimens might be misidentified as Capsella bursa-pastoris (L.) Medik. or Thlaspi arvense L., due to similarities in winter-annual habit, clasping-auriculate stem leaves, flattened obcordate silicles with winged margins, and white corollas less than 5 mm long. Capsella bursa-pastoris is stellate-pubescent, with basal leaves pinnately lobed or runcinate, and cuneate fruit bases, whereas N. perfoliata is nearly glabrous, with basal leaves obtusely dentate or entire, and obtuse fruit bases. Thlaspi arvense fruits are held perpendicularly, and have wide marginal wings (3.5–5 mm wide near apex) and a narrow, deep apical notch (to 5 mm deep), and the seed coats are concentrically striate, but N. perfoliata fruits are held more horizontally, and have narrower wings (1–2 mm wide near apex) and a wider, shallower apical notch (1–1.5 mm deep), and the seed coats are smooth. Noccaea perfoliata also tends to be half the size of either of those species, with stems typically less than 40 cm tall. A description follows, based on Al-Shehbaz (2010).

Description.—Noccaea perfoliata (L.) Al-Shehbaz (= Microthlaspi perfoliatum (L.) F.K. Mey.) (Figs. 1–5). Plants diminutive, herbaceous, winter annuals; glabrous and glaucous; stems to 28(–40) cm, often purple-tinged, sometimes branching; basal leaves in a loose rosette (some withered by fruiting), petiolate, blades elliptic to ovate, to 2(–2.7) cm long, apex rounded, margins entire or remotely and obtusely dentate; stem leaves alternate, sessile, ovate-cordate, to 4(–5.5) cm long, margins entire to repand or with a few obtuse teeth, bases auricled and strongly cordate-clasping (amplexicaul); racemes corymbose, several-flowered, considerably elongated in fruit; sepals 4, green with white margins, apices often pinkish or purplish; petals 4, white, 2–3.5(–4.7) mm long × 0.5–1.3 mm wide, spatulate to oblanceolate, claw obscure; stamens 6, slightly tetradynamous; fruiting pedicels slender, 2.5–8 mm long, spreading or horizontal; fruits silicles, dehiscent, sessile (lacking a gynophore), obcordate, 3–6.5(–8) mm long × (2.5–)3–6(–7) mm wide, strongly flattened perpendicular to the replum separating the two locules, the midline (valve) keeled, marginal wings narrow basally increasing to 1–2 mm wide near fruit apex, apical notch 1–1.5 mm deep; style obsolete or to 0.3 mm long, stigma capitate; ovules 4–8 per ovary; seeds ovoid, smooth, yellowish, unwinged, mucilaginous when wetted. Flowering Jan–Mar (in Texas).


The documentation of an adventive, annual, exotic weed in Texas seems an inconsequential thing amid the existential turmoil of the COVID pandemic, and it feels strange to focus on the communication of this minor botanical drama. This little plant is not generally considered noxious in North America, and is unlikely to have major economic impacts if it should naturalize in Texas; it merely joins the huge cohort of other European springtime annuals and biennials that thrive on disturbed ground and grassy, weedy roadsides—species that infrequently displace or crowd out any native plants in those already completely unnatural environments. As we consider the ease of weed propagule dispersal, we are now witnesses to the worldwide dispersal of the most noxious organism of our lifetimes. While the documentation of the SARS-CoV2 invasion is appropriately prolific, the record of it should be immortalized in all our rhetoric, perhaps especially in the typically dispassionate documentation of natural history—perhaps the only news we will still re-read, hundreds of years after it is written.


We sincerely thank Ihsan A. Al-Shehbaz for confirming the species determination and reviewing a draft of this manuscript, and for his heroic research untangling the mysteries of the mustard family. We are grateful for the organizations and funding sources that support iNaturalist.org, and thank all the citizen scientists contributing valuable observations of Texas plants. We appreciate helpful manuscript reviews from Jason Singhurst and David Lemke. Finally, we can hardly express our gratitude to all those who labored collaboratively for decades to create the standards, tools, and portals that now allow us to reap the benefits of digitized natural history collections and associated literature.


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Fig. 1. Claspleaf pennycress in Grayson Co., Texas, on 2019-01-31: petiolate rosette leaves and early inflorescence (photo by Sam Kieschnick; iNaturalist observation 20000793).

Fig. 2. Claspleaf pennycress in Grayson Co., Texas, on 2019-01-31: inflorescence with immature fruits (photo by Sam Kieschnick; iNaturalist observation 20000793).

Fig. 3. Claspleaf pennycress in Collin Co., Texas, on 2020-03-04: petiolate basal leaves and cordate-clasping (amplexicaul) stem leaves (photo by Sam Kieschnick; iNaturalist observation 39559646).

Fig. 4. Claspleaf pennycress in Collin Co., Texas, on 2020-03-04: cordate-clasping stem leaves and lower raceme with maturing fruits (photo by Sam Kieschnick; iNaturalist observation 39559646).

Fig. 5. Claspleaf pennycress in Collin Co., Texas, on 2020-03-04: inflorescence with immature fruits (photo by Sam Kieschnick; iNaturalist observation 39559646).

פורסם ב מרץ 24, 2021 07:21 אחה"צ על־ידי sambiology sambiology | 15 comments | הוספת תגובה

מרץ 23, 2021

Mothing at Mockingbird Nature Park! April 30! (not a public event, but open to iNatters/moth-ers)

Hey all!

So, most public bioblitzes are still wisely being postponed or cancelled, and it's a bit of a bummer... buuuut, if you want to gather with some fellow moth-ers, we're planning a little mothing at Mockingbird Nature Park on the first day of the city nature challenge! This will be on Friday, April 30th. Big time thanks to @cgritz for the contacts to allow us to do this.

Now, let's still do this wisely -- have your mask with you at all times. Wear it when you're close to others. Stay some distance from other folks. This is just smart and kind to do, so let's do it.

Who can come? Well, anyone! However, we don't want to promote it as a public event -- this is more of a 'gathering of moth-ers.' :)

If you don't feel comfortable coming, totally no problem -- I promise that we'll be able to do more of these in the future!

Again, Friday, April 30th, Mockingbird Nature Park in Midlothian (https://www.midlothian.tx.us/facilities/facility/details/Mockingbird-Nature-Park-10). If you have some moth gear, bring it! I don't think we'll have access to electricity, which is fine -- I've got some portable batteries to run about 7 stations myself! But if you have some gear, bring it!

If you have questions or concerns, please toss up a comment or send me a message. Thanks!

פורסם ב מרץ 23, 2021 09:13 אחה"צ על־ידי sambiology sambiology | 31 comments | הוספת תגובה