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island broom

Photo is of parent taxon

San Miguel Island deerweed

Habit Shrubs or subshrubs, erect or procumbent, low to robust, green or gray, 5–20 dm, not fleshy, sparsely to densely strigose; from woody caudices. Subshrubs (shrubs), gray, densely strigose to almost silky.
Stems

1–10+, erect or decumbent, branched, woody, leafy.

decumbent, ± woody.

Leaves

irregularly pinnate;

stipules glandlike; short-petiolate to petiolate;

rachis 3–10 mm, not flattened;

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

Leaflets

3, blades usually gray, surfaces densely strigose, almost silky.

Inflorescences

(3–)7–12-flowered.

Peduncles

ascending, 2–10 mm, shorter than leaves;

bract absent or unifoliolate, subtending umbel.

Umbels

bract unifoliolate.

Flowers

8–12 mm;

calyx 4–6 mm, tube sparsely strigose to glabrate, lobes short-subulate to deltate;

corolla yellow, claws ± longer than calyx tube, banner implicate-ascending to 90°, wings ± equaling keel;

style abruptly incurved 90°, glabrous.

Legumes

persistent, exserted, divergent to declined, brown, straight or curved, turgid, slightly constricted, not septate, linear-oblong, 10–50 × 1–2 mm, leathery, apex tapering, long-beaked, indehiscent, ± veined, margins thickened, smooth, glabrate or sparsely strigose.

(20–)30–50 mm.

Ovules

4–6.

Seeds

1–4(–6), brown (paler veined), not mottled, cylindric, smooth.

Acmispon dendroideus

Acmispon dendroideus var. veatchii

Phenology Flowering (late winter–)spring(–early fall).
Habitat Open, dry sites near ocean, bluffs, sandy flats, inland in canyons, brushy and rocky slopes, ridges, washes.
Elevation 0–400 m. (0–1300 ft.)
Distribution
California
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[BONAP county map]
Discussion

Varieties 3 (3 in the flora).

In a phylogeographic study of Acmispon dendroideus, L. E. Wallace et al. (2017) showed that var. traskiae is sister to vars. dendroideus and veatchii. Acmispon dendroideus has been reported from Baja California, Mexico, but the material is inadequate for confident determination.

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

Variety veatchii is known only from San Miguel Island, where it is uncommon. Reports of this variety from Baja California remain to be confirmed with better material.

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

Key
1. Subshrubs (shrubs); stems decumbent; leaflets 3, blades densely strigose, almost silky, usually gray.
var. veatchii
1. Shrubs; stems erect; leaflets 3–5, blades sparsely strigose, greenish.
→ 2
2. Umbel bract absent; ovules 1–3; legumes 10–15 mm.
var. dendroideus
2. Umbel bract unifoliolate; ovules 4–6; legumes (20–)30–50 mm.
var. traskiae
Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Acmispon Fabaceae > subfam. Faboideae > Acmispon > Acmispon dendroideus
Sibling taxa
A. americanus, A. argophyllus, A. argyraeus, A. brachycarpus, A. cytisoides, A. decumbens, 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
A. dendroideus var. dendroideus, A. dendroideus var. traskiae
Subordinate taxa
A. dendroideus var. dendroideus, A. dendroideus var. traskiae, A. dendroideus var. veatchii
Synonyms Syrmatium dendroideum, Hosackia dendroidea, Lotus dendroideus, L. scoparius var. dendroideus Hosackia veatchii, Lotus dendroideus var. veatchii, L. scoparius var. veatchii, L. veatchii, Syrmatium patens, S. veatchii
Name authority (Greene) Brouillet: J. Bot. Res. Inst. Texas 2: 389. (2008) (Greene) Brouillet: J. Bot. Res. Inst. Texas 2: 389. (2009)
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