Flora of North America species comparison

The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

Acmispon argophyllus

California deervetch or trefoil, silver bird's-foot trefoil, silver lotus
Habit Herbs, perennial, or subshrubs, cespitose and ± prostrate, or shrubby and spreading to ascending, low or robust, silvery or gray, 1–6(–10+) dm, not fleshy, tomentose to canescent or strigose; from woody caudices.
Stems

1–20+, prostrate or decumbent to ascending, branched, herbaceous, slender, or ± woody, leafy, sometimes congested at tips.
Leaves

irregularly pinnate to subpalmate;

stipules glandlike; short-petiolate;

rachis 2–10 mm, ± flattened;

leaflets (3 or)4 or 5(–7), blades obovate to elliptic-lanceolate or ovate, apex acute, surfaces densely sericeous.
Inflorescences

3–20-flowered, capitate.
Peduncles

ascending, 0–6(–40) mm, shorter to longer than leaves;

bract absent or unifoliolate, subtending umbel.
Flowers

6–12 mm;

calyx 5–7 mm, tube densely villous, lobes subulate, shorter than or equal to tube;

corolla yellow to orange, turning red or brown, claws shorter than calyx tube, banner implicate-ascending, wings ± equaling keel;

style curved, glabrous.
Legumes

persistent, included to moderately (–strongly) exserted, ascending to divergent, reddish brown, arched, turgid, not constricted, not septate, lanceoloid, 6–10 × 1–2 mm, leathery, apex short-beaked, tapering, curved or geniculate, indehiscent, smooth, margins keeled smooth, glabrate to silky.
Seeds

1 (or 2), tawny, mottled, curved-oblong, elongate, smooth.

Acmispon argophyllus
Distribution
nw Mexico; California
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 6 (5 in the flora).

D. Isely (1981) reported a potential hybrid between Acmispon argophyllus (variety not specified) and A. glaber (variety not specified). Variety ornithopus (Greene) Brouillet is endemic to Guadalupe Island (Baja California, Mexico). In a phylogeographic study of A. agrophylus, L. E. Wallace et al. (2017) showed that the insular endemic varieties are distinct, although var. argenteus is paraphyletic to var. adsurgens, with var. niveus of Santa Cruz sister to all remaining varieties in the species, including the continental ones.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Herbs, perennial; stems prostrate or decumbent-ascending; mainland California.
→ 2
2. Umbels 3–7-flowered, not congested, peduncles 1–6+ mm; calyces 5–6 mm, lobes 1.5–2(–3.5) mm; banner claw shorter than blade; s Sierra Nevada, s California ranges.
var. argophyllus
2. Umbels 10–15-flowered, congested at branch tips, peduncles 0–2 mm; calyces 6–7 mm, lobes 2–3(–5) mm; banner claw scarcely shorter than blade; n Sierra Nevada.
var. fremontii
1. Subshrubs (mostly); stems ascending to erect, sometimes prostrate; Channel Islands.
→ 3
3. Umbels 12–20-flowered, peduncles 5–40 mm.
var. argenteus
3. Umbels 6–13-flowered, peduncles 1–5 mm.
→ 4
4. Stems ascending to erect, densely leafy; umbels 10–13-flowered; San Clemente Island.
var. adsurgens
4. Stems ascending to bushy and spreading, not densely leafy; umbels 6–10-flowered; Anacapa and Santa Cruz islands.
var. niveus
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Acmispon
Sibling taxa
A. americanus, A. argyraeus, A. brachycarpus, A. cytisoides, A. decumbens, A. dendroideus, A. denticulatus, A. glaber, A. grandiflorus, A. haydonii, A. intricatus, A. junceus, A. maritimus, A. mearnsii, A. micranthus, A. neomexicanus, A. parviflorus, A. plebeius, A. procumbens, A. prostratus, A. rigidus, A. rubriflorus, A. strigosus, A. tomentosus, A. utahensis, A. wrangelianus, A. wrightii
Subordinate taxa
A. argophyllus var. adsurgens, A. argophyllus var. argenteus, A. argophyllus var. argophyllus, A. argophyllus var. fremontii, A. argophyllus var. niveus
Synonyms Hosackia argophylla, Lotus argophyllus, Syrmatium argophyllum
Name authority (A. Gray) Brouillet: J. Bot. Res. Inst. Texas 2: 388. (2008)
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).



Type/paste one or more Latin names into the boxes above; matching taxa will show up below the box as you type. You can use the up/down arrow keys to move through the list.

(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Fabaceae, Apiaceae, Boraginaceae, and Polemoniaceae.)

Choose a data source: Flora of North America

The species comparison tool is brought to you by:
Northwest Wildflowers