Flora of North America species comparison

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Desmodium batocaulon

San Pedro tick trefoil
Habit Herbs, perennial.
Stems

decumbent or decumbent-assurgent, branched, 30–120 cm, densely uncinate-pubescent.
Leaves

tri-foliolate;

stipules caducous, narrowly ovate, 5+ mm;

petiole 20–30 mm;

leaflet blades ovate-elliptic to narrowly so, apex acute to obtuse, surfaces densely appressed-pubescent abaxially, sparsely so adaxially;

terminal blade (20–)35–60 × 8–10(–15) mm, length 2.5–4 times width.
Inflorescences

axillary and terminal, branched or unbranched;

rachis patent uncinate-puberulent to pubescent;

primary bracts closely imbricate before anthesis, caducous, ovate, 5 mm.
Pedicels

5–10 mm.
Flowers

calyx 3–4 mm, sparsely pubescent, tube 1 mm;

abaxial lobes 3 mm, lateral lobes 2 mm;

corolla pink or purple to blue, 7–9 mm.
Loments

sutures undulate abaxially, sinuate adaxially;

connections adaxial, 1/4–1/3 as broad as segments;

segments 4–7, semiorbiculate, 3–5 × 3–3.5 mm, rounded abaxially, slightly convex adaxially, glabrous or sparsely uncinate-puberulent throughout;

stipe 1–2 mm.

Desmodium batocaulon
Phenology Flowering late summer–fall.
Habitat Dry, rocky woodlands, pine or oak-juniper woodlands, canyons, roadsides.
Elevation 1200–2100 m. (3900–6900 ft.)
Distribution
from FNA
AZ; NM; Mexico (Baja California, Baja California Sur, Chihuahua, Guerrero, Sonora, Tamaulipas, Zacatecas)
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Discussion

In the flora area, Desmodium batocaulon is known from southeastern Arizona and southwestern New Mexico.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Desmodium
Sibling taxa
D. arizonicum, D. canadense, D. canescens, D. cinerascens, D. cuspidatum, D. floridanum, D. grahamii, D. gramineum, D. illinoense, D. incanum, D. intortum, D. laevigatum, D. lindheimeri, D. lineatum, D. marilandicum, D. metcalfei, D. nuttallii, D. ochroleucum, D. paniculatum, D. procumbens, D. psilocarpum, D. psilophyllum, D. retinens, D. rosei, D. rotundifolium, D. scopulorum, D. scorpiurus, D. sessilifolium, D. strictum, D. tenuifolium, D. tortuosum, D. triflorum, D. tweedyi, D. viridiflorum, D. ×humifusum
Synonyms Meibomia batocaulos
Name authority A. Gray: Smithsonian Contr. Knowl. 5(6): 47. (1853)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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