Desmodium batocaulon |
Desmodium psilocarpum |
|
---|---|---|
San Pedro tick trefoil |
Santa Cruz Island ticktrefoil |
|
Habit | Herbs, perennial. | Herbs or shrubs, perennial. |
Stems | decumbent or decumbent-assurgent, branched, 30–120 cm, densely uncinate-pubescent. |
erect or ascending, branched, 40–100 cm, slightly uncinate-pubescent and pilose or glabrescent. |
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. |
trifoliolate; stipules mostly persistent, broadly ovate, 4–10 mm, base subamplexicaul; petiole 30–40 mm; leaflet blades broadly ovate-elliptic or ovate to narrowly ovate, apex acute, surfaces uncinate-puberulent; terminal blade 20–70(–100) × 10–20(–50) mm, length 1.8–2 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. |
branched or unbranched; rachis bulbous-villous and uncinate-puberulent; primary bracts caducous, subulate, 1 mm. |
Pedicels | 5–10 mm. |
10–20 mm, patent uncinate-pubescent. |
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. |
calyx 1.5–2 mm, pilose and uncinate-puberulent, tube 0.8 mm; abaxial lobes 1 mm, lateral lobes 0.8–1 mm; corolla pink-purple, fading greenish, 4–5 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. |
sutures subequally deeply crenate; connections central, 1/8–1/7 as broad as segments; segments 3–6, rounded, 6–10 × 5–7 mm, rounded, sparsely pubescent, at least on sutures; stipe 1(–2) mm. |
Desmodium batocaulon |
Desmodium psilocarpum |
|
Phenology | Flowering late summer–fall. | Flowering late summer–fall. |
Habitat | Dry, rocky woodlands, pine or oak-juniper woodlands, canyons, roadsides. | Woodland, grasslands, canyon slopes, streamsides. |
Elevation | 1200–2100 m. (3900–6900 ft.) | 1000–2000 m. (3300–6600 ft.) |
Distribution |
AZ; NM; Mexico (Baja California, Baja California Sur, Chihuahua, Guerrero, Sonora, Tamaulipas, Zacatecas)
|
AZ; NM; Mexico (Chihuahua, Nuevo León, Sonora, Tamaulipas) |
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.) |
Desmodium psilocarpum is known in the flora area from southern Arizona and adjacent southwestern New Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Desmodium | Fabaceae > subfam. Faboideae > Desmodium |
Sibling taxa | ||
Synonyms | Meibomia batocaulos | Meibomia psilocarpa |
Name authority | A. Gray: Smithsonian Contr. Knowl. 5(6): 47. (1853) | A. Gray: Smithsonian Contr. Knowl. 5(6): 48. (1853) |
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