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Psorothamnus arborescens var. simplifolius

Psorothamnus arborescens (Torr. ex A. Gray) Barneby var. simplifolius (Parish) Barneby

California Indigobush

Fabaceae (Pea family)

Synonym(s): Dalea californica, Dalea fremontii var. simplifolia


USDA Native Status: L48 (N)

"Habit nearly of 2 preceding, but canescently silky throughout with subappressed and ascending hairs up to 0.2-0.35 mm long, the lower leaves sometimes green and glabrescent." (bibref: 1812).


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Plant Characteristics

Duration: Perennial
Habit: Shrub
Leaf Arrangement: Alternate
Size Notes: "3-10 dm tall." (bibref: 1812).
Leaf: "Leaves 3-35 mm long, the leaflets mostly 5 or 7, seldom 3 or 9, oblanceolate to narrowly elliptic, 2-12 mm long, all decurrent on the rachis or some (exceptionally almost all) leaves reduced to a bractlike simple blade less than 1 cm long." (bibref: 1812).
Flower: "Racemes 3-15 cm long; calyx densely silky-strigulose externally, 5.2-6.9 mm long, the hypanthium 1.8-2.2 mm deep, the tube 3.2-4.2 mm, the ventral pair of teeth 1.9-3.7 mm long (1.9 mm shorter to 0.5 mm longer than tube) and 1.5-2.1 mm wide; petals indigo-blue; banner 6.3-7.8 mm, its claw 1-1.5 mm, its blade 5.4-6.3 mm long, 5.2-5.8 mm wide; keel 8.5-8.8 mm long, the claws 2.8 mm, the blades 5.8-6.4 mm long, 3.3-3.9 mm wide." (bibref: 1812).
Fruit: "Pod obliquely ellipsoid or ovoid-ellipsoid, the subcompressed body (6) 7-9 mm long, 4-5 mm diameter, at least beyond the middle 2-carinate by the sutures, the convex valves charged with large, round or broadly elliptic blister-glands, subglabrous, the ventral suture ciliolate; seed (4.7) 5-6 mm long." (bibref: 1812).

Bloom Information

Bloom Color: Blue
Bloom Time: Jan , Feb , Mar , Apr , May , Jun
Bloom Notes: "Petals indigo-blue." (bibref: 1812).


Native Distribution: "Locally plentiful along the southern and southeastern foothills of San Bernardino Mountains in Riverside and extreme southern San Bernardino counties, California, from Whitewater Pass through upper Coachella Valley to the Little San Bernardino Mountains, norhteast through Morongo Pass, thence passing into P. a. var. minutifolius; from Whitewater extending southwestward feebly into San Jacinto Valley west of the desert proper." (bibref: 1812).
Native Habitat: "Rocky benches and bouldery washes, coming out on stony flats with larrea to the edge of the desert floor, 135-1050 m (450-3500 ft)." (bibref: 1812).

Additional resources

USDA: Find Psorothamnus arborescens var. simplifolius in USDA Plants
FNA: Find Psorothamnus arborescens var. simplifolius in the Flora of North America (if available)
Google: Search Google for Psorothamnus arborescens var. simplifolius


Record Modified: 2020-12-07
Research By: JAM

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