Mapping Mule’s Ears

One common factor contributing to mistakes when people are identifying plants is the scarcity of user-friendly visual documentation (i.e., maps) showing where different species occur in the world. Sure, more than one species of a genus will often co-occur in the same general area, but maps can help you quickly narrow down the number of possibilities in a given area.

Another aid that’s commonly missing is an explanation of how one species differs from a small set of related or similar species, where they may occur near each other. Keys can provide the technical details for distinguishing one plant from all others in a genus-wide or family-wide context, often over a wide area, but may obscure the simple details that can distinguish “Species A” from “Species D” where just those two happen to occur together.

How nice it would be to have more maps of species distributions based on current data for collections and observations. Such maps, together with keys and notes on how to distinguish one species from others in the same area, could facilitate more accurate identifications—especially in genera with little to moderate overlap of species ranges.

Wyethia mollis

This could be a fun project to help pass a pandemic winter, yes?

To explore the idea a bit further, I looked for a genus of modest size in western North America, with at least one species in Mono County. There are many genera to choose from. I selected Wyethia, commonly known as Mule’s Ears (or Mule Ears or Mules Ears), a genus with 14 distinct and well-documented species scattered across the mountains, hills, and deserts of western North America. Hikers in the upper elevations and east side of the Sierra Nevada will know Woolly Mule’s Ears (Wyethia mollis) as one of the brightest and showiest sunflowers of the region.

Here, then, is Mule’s Ears: an Atlas and Guide, a free PDF on my Downloads page. Look it over and let me know if you find this approach and format useful (corrections and suggestions are always welcome).

A Note on Taxonomy
Traditionally, the 14 species of Mule’s Ears have been grouped all together in the genus Wyethia. (As of this date, the Jepson eFlora still treats all California species under Wyethia.) Currently, however, most sources recognize 3 separate genera in this group: Wyethia in a stricter sense (with 8 species), Agnorhiza (with 5 species), and Scabrethia (with 1 species). These are differentiated mostly by the shape, relative sizes, and distribution of leaves. Personally, I’m not always a fan of splitting genera by their sections, but in this case, I think it helps us recognize very visible differences within the group and makes the keys more manageable.

Methods
I downloaded location data (in CSV format) for herbarium collections of each species from the California Consortium of Herbaria (CCH), the Southwest Environmental Information Network (SEINet), the Intermountain Regional Herbarium Network, and the Consortium of Pacific Northwest Herbaria, along with crowd-sourced observation data from iNaturalist. These I imported to a base map of US states and counties, Canadian provinces, and Mexican states using QGIS (a free, open source GIS application).

For each species I exported a PDF dot map of collections and observations. These I placed into Adobe Illustrator, aligned with a clean base of only the state and county boundaries. I then traced the approximate boundaries of the occurrence clouds. In doing so, I did quick reality checks on occurrences that appeared inconsistent with overall distribution patterns or distributions reported in the literature. Many of these anomalies turned out to be obvious misidentifications or incorrect mapping of collection coordinates. Colors and patterns were used to differentiate species in the maps.

The final booklet, together with photographs licensed for non-commercial use by iNaturalist contributors (acknowledged in the booklet), was assembled in Adobe InDesign.

How to use this Booklet
1. Download the 16-page PDF from the DOWNLOADS PAGE. I suggest saving this into the library of the books app on your smart phone or tablet (e.g., Books on Apple devices) to keep it handy in the field. The pages are formatted as half-letter size (5.5 X 8.5 inches), so it’s fairly readable on your phone (if you’re near-sighted) or on your tablet.

2. You can also print this as a 16-page booklet from your computer using Adobe Acrobat or Adobe Reader (and probably other PDF apps). Tell the application to print all pages in Booklet format, both sides, left binding, and auto-rotate pages. Use letter-size (8.5 X 11) paper, and select your specific printer (not the generic “Any Printer”) and “US Letter” paper size in the printer dialog. This should result in the pages being filled and with centers properly aligned for folding. After printing, arrange as needed to make sure the page numbers are in proper sequence, fold the stack in the middle, and staple along the fold (a long-reach stapler works best for this).

3. Go forth and Botanize!


Copyright © Tim Messick 2021. All rights reserved.

A Guide to Plants of Berlin-Ichthyosaur State Park

Cover for Plants of Berlin Ichthyosaur State Park

EARLIER THIS YEAR I posted a preliminary checklist of plants in and around Berlin-Ichthyosaur State Park in northwestern Nye County, Nevada. I’ve expanded that list so that it’s now the first edition of a “guide” to the flora there. It’s intended to help visitors who are curious about plant life in the area recognize some of the rich biodiversity of this park and the central Great Basin region. This is a free PDF you can obtain from my Downloads page.

Native and naturalized plant species are listed by major taxonomic group (Gymnosperms, Dicots, and Monocots), then alphabetically by family and species. Each plant is described very briefly with regard to its habitat and/or location in the park, plus a few prominent identifying characteristics. I also prepared a new map of the area, derived from USGS topographic quadrangles (edited in Adobe Illustrator, with Avenza MAPublisher). Sorry, no illustrations yet. . . perhaps in a future edition.

This is still a work in progress. Some identifications may be incorrect and some are uncertain for plants that should keyed again with better flowering or fruiting material. Additional plants not yet included are to be expected, especially among the grasses and the annual dicots. (Please let me know if you have additions or corrections!)

Penstemon sp.

Penstemon sp.

Not surprisingly, the genus genus Astragalus (Milkvetches or Locoweeds) appears to be the most diverse genus in the area, with at least 7 species. Penstemon (Beardtongues) and Eriogonum (Wild-buckwheats) come in a close second, with at least 5 species in each. The largest plant families include Asteraceae (Sunflower family) with at least 20 species, Brassicaceae (Mustard family) with at least 13 species, and Fabaceae (Pea family) with at least 11 species.

Astragalus newberryi

Stanleya pinnata

Stanleya pinnata

Sources for this list include my own field observations during 2018–2020, observations posted by others on iNaturalist, and specimen records in the Intermountain Regional Herbarium Network. Photographs of the plants, lichens, insect galls, and animals that I and others have observed in the area can be seen on iNaturalist, at https://www.inaturalist.org/observations?place_id=129800&subview=grid.

Map of Berlin-Ichthyosaur area


Copyright © Tim Messick 2020. All rights reserved. DOWNLOADS

California Biodiversity Day Bioblitz for Mono

Users of iNaturalist in or near the Mono Basin might like to join (and thereby automatically contribute to) the “California Biodiversity Day 2020” Bioblitz for the greater Mono Lake area, including Lee Vining Canyon and Lundy Canyon. The project actually runs for a week, September 5 through 13, 2020. Details are on iNaturalist HERE.

I may not get over to Mono myself during this period, but I’ll be helping to identify observations that others make. Here’s a map showing the area in which observations will be added to the project (orange shading):

Map of the project area

Keep cool and hydrated out there — it’s going to be hot and a bit smoky the next few days.


UPDATE 9/6/2020: Oh well, never mind. Too much smoke from the Creek Fire in Fresno and Madera counties (https://inciweb.nwcg.gov/incident/7147/). Air quality is “hazardous” in Lee Vining, with the index over 350. (Up to 460 in Mammoth!) Shelter from the smoke!

Lee Vining WebCam on Sunday morning

Lee Vining WebCam on Sunday morning (https://www.monolake.org/today/lvcam)


Copyright © Tim Messick 2020. All rights reserved.
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