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chaparral bird's-foot trefoil, large leaf lotus, large-flower lotus

Habit Herbs, perennial, cespitose, sometimes robust, grayish or green, 1–4(–15) dm, not fleshy, ± densely puberulent or strigillose; rhizomatous, woody based.
Stems

1–5+, decumbent to erect, branched, herbaceous, often striate, leafy.

Leaves

irregularly pinnate;

stipules glandlike, conic; petiolate or sessile;

rachis 2–3.5(–5.5) mm, not flattened;

leaflets 7–9(–12), blades usually elliptic to obovate, sometimes ovate, apex acute to obtuse, surfaces sparsely to densely puberulent or villosulous to strigillose.

Inflorescences

3–9(–11)-flowered.

Peduncles

ascending or spreading, 10–80 mm, longer than leaves;

bract 1(–3)-foliolate, distal.

Flowers

12–25 mm;

calyx (4.5–)5.5–10 mm, tube villosulous, lobes subulate;

corolla greenish white, white or yellow, fading to rose or reddish, claws shorter than calyx tube, banner ascending 45–90°, wings longer than banner and keel;

style nearly straight or basally curved, glabrous.

Legumes

persistent, exserted, brown, linear-oblong, straight, turgid, sometimes slightly constricted, incompletely septate, 25–42(–70) × 2–3 mm, leathery, apex short hook-beaked, dehiscent, smooth, margins smooth, thickened, glabrate.

Seeds

5–9, olive to reddish brown, mottled, broadly ovoid, smooth.

Acmispon grandiflorus

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

Varieties 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Herbs densely puberulent or villosulous, usually grayish; ovules 22–30.
var. grandiflorus
1. Herbs strigillose or puberulent, green; ovules ca. 45.
var. macranthus
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Acmispon
Sibling taxa
A. americanus, A. argophyllus, A. argyraeus, A. brachycarpus, A. cytisoides, A. decumbens, A. dendroideus, A. denticulatus, A. glaber, 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. grandiflorus var. grandiflorus, A. grandiflorus var. macranthus
Synonyms Hosackia grandiflora, Anisolotus grandiflorus, Lotus grandiflorus, Ottleya grandiflora
Name authority (Bentham) Brouillet: J. Bot. Res. Inst. Texas 2: 390. (2008)
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