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FABACEAE (Leguminosae) LEGUME FAMILY

Martin F. Wojciechowski, except as noted

Annual to tree. Leaf: generally alternate, generally compound, generally stipuled, generally entire, pinnately veined Inflorescence: generally raceme, spike, umbel or head; or flowers 1–few in axils. Flower: generally bisexual, generally bilateral; hypanthium 0 or flat to tubular; sepals generally 5, generally fused; petals generally 5, free, fused, or lower 2 ± united into keel (see 3, Key to Groups, for banner, wings); stamens 10 or many (or [1], 5, 6, 7, 9), free or fused or 10 with 9 filaments at least partly fused, 1 (uppermost) free; pistil 1, ovary superior, generally 1-chambered, ovules 1–many, style, stigma 1. Fruit: legume, including a stalk-like base (above receptacle) or not. Seed: 1–many, often ± reniform, generally hard, smooth.
± 730 genera, 19400 species: worldwide; with grasses, requisite in agriculture, most natural ecosystems. Many cultivated, most importantly Arachis, peanut; Glycine, soybean; Phaseolus, beans; Medicago, alfalfa; Trifolium, clovers; many orns. [Lewis et al. (eds) 2005 Legumes of the World. RBG, Kew] Unless stated otherwise, fruit length including stalk-like base, number of 2° leaflets is per 1° leaflet. Upper suture of fruit adaxial, lower abaxial. Anthyllis vulneraria L. evidently a waif, a contaminant of legume seed from Europe. Laburnum anagyroides Medik., collected on Mount St. Helena in 1987, may be naturalized. Ceratonia siliqua L., carob tree (Group 2), differs from Gleditsia triacanthos L. in having evergreen (vs deciduous) leaves that are 1-pinnate (vs 1-pinnate on spurs on old stems, 2-pinnate on new stems) with 2–5(8) (vs 7–17) 1° leaflets, commonly cultivated, now naturalized in southern California. Aeschynomene rudis Benth. <Noxious weed>, Halimodendron halodendron (Pall.) Voss <Noxious weed> (possibly extirpated), Lens culinaris Medik. are agricultural weeds. Caragana arborescens Lam. only cultivated. Ononis alopecuroides L. <Noxious weed>, Sphaerophysa salsula (Pall.) DC. <Noxious weed> all evidently extirpated. Cercidium moved to Parkinsonia; Chamaecytisus to Cytisus; Psoralidium lanceolatum to Ladeania. —Scientific Editors: Martin F. Wojciechowski, Thomas J. Rosatti.

Key to Fabaceae

PSOROTHAMNUS INDIGO-BUSH

Martin F. Wojciechowski & Duane Isely

Perennial herb to small tree, generally thorny, gland-dotted, especially stems, generally hairy. Stem: generally intricately branched. Leaf: simple or generally odd-1-pinnate, leaflets 1–3, generally more. Inflorescence: axillary or terminal, raceme, spike- or head-like or not; pedicel bractlets (0)2. Flower: calyx lobes generally unequal, upper 2 often largest; petals from receptacle, indigo blue to pink-purple; stamens 10, filaments partly fused; ovules generally 2. Fruit: indehiscent, included in or exserted from calyx, generally glandular. Seed: 1.
9 species: deserts of southwestern United States, Mexico, basins of Colorado Plateau. (Greek: scabshrub)
Unabridged references: [Barneby 1977 Mem New York Bot Gard 27:21–54, 598–607]

Key to Psorothamnus

P. fremontii (A. Gray) Barneby FREMONT'S DALEA
NATIVE
Shrub < 1 m, generally silvery-strigose. Leaf: leaflets except uppermost generally jointed to axis. Inflorescence: ± open, 10–25-flowered; pedicel bractlets 2. Flower: calyx 5–9 mm, lobes unequal, < tube; corolla 7–9.5 mm, magenta-purple, glands 0. Fruit: exserted, 7–10 mm, hairs 0, glands many, small, in longitudinal lines especially distally, orange.
2n=20. Like Psorothamnus arborescens except in fruit, geography. [Online Interchange]
Unabridged note: Expanded author citation: Psorothamnus fremontii (Torr. ex A. Gray) Barneby

P. fremontii var. fremontii
NATIVE
Leaf: leaflets 3–15 mm, ± 1.5–3 mm wide, narrowly elliptic to ovate or obovate.
Granite, volcanic slopes, flats, canyons; generally on sedimentary formations; 150–1350 m. Mojave Desert; to southern Utah, northeastern Arizona. Apr–May [Online Interchange]
Unabridged note: Expanded author citation: Psorothamnus fremontii (Torr. ex A. Gray) Barneby var. fremontii

Previous taxon: Psorothamnus fremontii var. attenuatus
Next taxon: Psorothamnus polydenius

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Jul 25 2014
Citation for this treatment: [Author of taxon treatment] 2013. Psorothamnus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=64586, accessed on Jul 25 2014

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click for enlargement Psorothamnus fremontii var. fremontii
See CalPhotos for additional images
2005 James M. Andre

Bioregions in which Psorothamnus fremontii var. fremontii occurs Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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map of distribution 1
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.