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Psorothamnus fremontii var. attenuatus

Psorothamnus fremontii (Torr. ex A. Gray) Barneby var. attenuatus Barneby

Fremont's Dalea

Fabaceae (Pea family)



USDA Native Status: L48 (N)

"Low straggling or erect, irregularly branching shrubs up to 3-10 dm tall, stiff but hardly thorny (spinose branchlets at nodes preceding the racemes rare or 0), the raceme-axes persistent but not spinose, the often tortuous old stems pallid or whitish, the young twigs and foliage eglandular or almost so, strigulose with appressed or narrowly ascending white hairs up to 0.2-0.35 (0.4) mm long, the foliage ashen or silvery, the leaflets often more densely pubescent above than beneath, their lower face punctate, the inflorescence-axis charged with prickle-shaped glands." (bibref: 1812).


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Plant Characteristics

Duration: Perennial
Habit: Shrub
Leaf Arrangement: Alternate
Size Notes: "Up to 3-10 dm tall." (bibref: 1812).
Leaf: "Leaf-spurs up to 1 mm long; stipules subulate or subulate-attenuate, subglandular, brown or livid, 0.7-1.2 mm long; intrapetlolular glands 0; post-petiolular glands small; leaves alternate along young flowering shoots and fascicled on inhibited short-shoots of old wood, all petioled, 1-4 cm long, with 3-7 (9) leaflets all linear, (3) 5-25 mm long, less than 1 (rarely to 1.2) mm wide; all sessile or nearly so, either all jointed to the rachis, or (especially in leaves low on the branchlets or fascicles) the terminal one often greatly drawn out and longer than the lateral ones,the margins gland-undulate." (bibref: 1812).
Flower: "Peduncles 0-1 (2) cm long; racemes loosely (5) 10-25 (30)-flowered, the axis becoming 2-9 (11) cm long; bracts papery, brownish, 1.2-2 mm long, early deciduous; bracteoles similar but smaller, 0.4-1.7 mm long; pedicels 0.6-1.4 mm long; calyx (5) 5.4-7.7 mm long, the hypanthium 1.2-1.9 mm deep, the glabrous or strigulose tube (2.8) 3-3.7 (3.9) mm long, the internally silky, lanceolate or triangular-lanceolate teeth unequal, the ventral pair 2.2-3.8 (4.1) mm long, varying from 1.1 mm shorter to 0.6 mm longer than tube, each at base (1.2) 1.4-2.1 mm wide, nearly twice wider than the divergent, ultimately reflexed dorsal tooth, the sinus behind the banner shallower than the lateral ones, the ribs prominent but not cordlike, the firm intervals charged with 1 row of 2-5 (the broader ventral pair with 4-7 scattered) small brown glands; petals vivid magenta-purple, glandless, in form like those of Psorthamnus arborescens; banner 7.3-9.3 mm long, the claw 1.1-2 mm, the blade (6) 6.3-7.4 mm long, (5.2) 5.6-6.8 mm wide; wings 7.5-9.9 mm long, the claw 2-3.1 mm, the blade 6.1-7.3 mm long, (2.6) 2.8-3.8 mm wide; keel (7.8) 8.2-9.8 mm long, the claws 2.2-3 mm, the blades (6) 6.4-7.5 mm long, (3.6) 4-4.7 mm wide; androecium 6.6-9.1 mm long, the filaments free through 3.2-4.4 mm, the pallid anthers (0.7) 0.9-1.2 mm long." (bibref: 1812).
Fruit: "Pod very obliquely ovoid-ellipsoid, subcompressed, the body 7-10 mm long, 4.2-5.3 mm wide, carinate by the nearly straight ventral and strongly convex dorsal sutures, the faces charged with very numerous small orange glands confluent lengthwise (especially distally) into ridges, glabrous except for thinly ciliolate keels; seed castaneous, smooth, 4.4-5.8 mm long." (bibref: 1812).

Bloom Information

Bloom Color: Purple
Bloom Time: Apr , May , Jun
Bloom Notes: "Petals vivid magenta-purple." (bibref: 1812).


Native Distribution: "Local along and near the lower Colorado River, from vicinity of Parker Dam (Whipple Mountains.) in extreme southeastern San Bernardino County California northward on both the California and Arizona sides into the southern point of Nevada near Davis Dam, thence northeastward in Mohave County, Arizona to the Grand Wash Cliffs south of Lake Mead." (bibref: 1812).
Native Habitat: "Desert hillsides and rocky canyon slopes, 170-900 m, on granitic and volcanic bedrock." (bibref: 1812).

Additional resources

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


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

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