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

desert deer-vetch, Hill lotus, short-flower bird's-foot trefoil, small-flower bird's-foot trefoil, small-flower lotus, small-flower trefoil

Habit Herbs, perennial, cespitose, sometimes robust, grayish or green, 1–4(–15) dm, not fleshy, ± densely puberulent or strigillose; rhizomatous, woody based. Herbs, annual, cespitose, green, 0.3–4.8 dm, not fleshy, glabrous or sparsely strigillose; taprooted.
Stems

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

1–10, erect to procumbent, branched or unbranched, herbaceous, 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.

irregularly pinnate to palmate;

stipules glandlike;

subsessile to short-petiolate;

rachis 2–8 mm, sometimes flattened;

leaflets 3–5, blades obovate to oblong or elliptic, apex obtuse, surfaces strigose.

Inflorescences

3–9(–11)-flowered.

1-flowered.

Peduncles

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

bract 1(–3)-foliolate, distal.

ascending, filiform, (0 or)1–26(–55) mm, shorter to 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.

(2.5–)4–6 mm;

calyx 1–2.5 mm, tube sparsely strigillose, lobes subulate;

corolla pink or salmon, quickly fading, with yellowish wings and keel, claws longer than calyx tube, banner implicate, wings ± equaling to slightly longer than keel;

style 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.

persistent, exserted, erect or spreading, brown or tawny, curved or straight, compressed, constricted, not septate, narrowly oblong, 15–27 × 2–2.5 mm, thinly leathery, apex short hook-beaked, dehiscent, smooth, margins smooth, thin, wavy, glabrous or sparsely strigillose.

Seeds

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

3–9, brown, not mottled, subglobose to shortly oblong, smooth.

2n

= 14.

Acmispon grandiflorus

Acmispon parviflorus

Phenology Flowering spring(–early summer).
Habitat Coastal bluffs, clearings in oak-pine or fir woodlands, open grassy areas, burnt chaparral, cut-overs, riverbars, banks, thickets, open disturbed areas, roadsides.
Elevation 0–1400 m. (0–4600 ft.)
Distribution
nw Mexico; California
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OR; WA; BC
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

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

Acmispon parviflorus occurs in California from the Peninsular Ranges, the South Coast, and the Channel Islands northward to the northwest, the Sacramento Valley, and the northern and central Sierra Nevada, through coastal western Oregon and Washington from the Cascade Range westward, into southwestern British Columbia.

(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. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Acmispon 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
A. americanus, A. argophyllus, 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. 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 Hosackia parviflora, Anisolotus parviflorus, H. microphylla, Lotus micranthus
Name authority (Bentham) Brouillet: J. Bot. Res. Inst. Texas 2: 390. (2008) (Bentham) D. D. Sokoloff: Ann. Bot. Fenn. 37: 129. (2000)
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