Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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Annual to tree
Leaves generally compound, alternate, stipuled; leaflets generally entire
Inflorescence: generally raceme, spike, umbel or head; flowers sometime 1–2 in axils
Flowers generally bisexual, generally bilateral; hypanthium generally flat or cup-like; sepals generally 5, fused; petals generally 5, free, or the 2 lower ± fused; stamens 1–many, often 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, sometimes including a stalk-like base above receptacle, dehiscent, or indehiscent and breaking into 1-seeded segments, or indehiscent, 1-seeded, and achene-like
Seeds 1–several, often ± reniform, generally hard, smooth
Genera in family: ± 650 genera, 18,000 species: worldwide; with grasses, requisite in agriculture and most natural ecosystems. Many cultivated, most importantly Arachis , peanut; Glycine , soybean; Phaseolus , beans; Medicago ; Trifolium ; and many orns
Reference: [Polhill & Raven (eds) 1981 Advances in legume systematics; Allen & Allen 1981 Leguminosae]
Family description and key to genera by Duane Isely.



Duane Isely

Perennial, unarmed, generally hairy, rhizomed
Stem erect; lower nodes leafless
Leaves palmately compound; lower stipules clasping stem, scarious, others not clasping, green; leaflets 3
Inflorescence: raceme, terminal; bracts like stipules, ± persistent
Flower: calyx lobes 5, but upper 2 variously fused; corolla yellow; stamens 10, free
Fruit slowly dehiscent, short or oblong, flat; base stalk-like; margin often wavy
Species in genus: ± 10 species: North America, Asia
Etymology: (Greek: like a lupine)
Reference: [Isely 1951 Mem New York Bot Garden 25(3):104–122]


T. macrophylla Hook. & Arn.

Plant green, gray, or silvery
Stem 0.3–2 m
Leaf: leaflets 2.5–6 cm, oblanceolate to ovate
Inflorescence 1–5 dm, 6–many-flowered; bracts conspicuous
Flower: calyx 7–10 mm, lobes ± = or < tube; corolla 15–25 mm; ovary generally hairy
Fruit spreading to erect, oblong, often curved, often narrowed in places by poor seed set
Seeds few–several
Chromosomes: 2n=18,36
Ecology: Grassland, chaparral, sandy scrub, woodlands, open ridges, disturbed areas
Elevation: < 2100 m.
Bioregional distribution: Northwestern California, Cascade Range, Central Western California, Southwestern California, Modoc Plateau
Distribution outside California: Oregon
Regionally diverse complex that has been classified variously.


var. argentata (Greene) Jeps.


Plant silvery-hairy
Stem generally > 3 dm
Leaf: hairs straight, appressed
Fruit ascending to erect
Chromosomes: 2n=18
Ecology: UNCOMMON. Pine forests, open ridges
Elevation: 900–1500 m.
Bioregional distribution: Cascade Range (Siskiyou, Shasta cos.), Modoc Plateau (Modoc, Lassen cos.)
Synonyms: T. argentata Greene
Horticultural information: TRY.

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bioregional map for THERMOPSIS%20macrophylla%20var.%20argentata being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Thermopsis macrophylla var. argentata
Retrieve dichotomous key for Thermopsis
Retrieve multiple-entry key (MEKA) for Thermopsis
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
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