Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



Michael R. Mesler and Karen Lu

Perennial from rhizome, woody vine, shrub, aromatic
Stem branched, sometimes nearly all underground
Leaves simple, basal, cauline, or arising singly from rhizome, alternate; blade generally cordate, entire
Inflorescence: flower generally solitary, axillary or terminal
Flower bisexual, radial or bilateral; sepals 3, free or fused; petals generally 0; stamens generally 6 or 12, free or fused to style; pistil generally 1, ovary generally inferior or partly so, chambers generally 6
Fruit: generally capsule
Seeds many
Genera in family: 10 genera, 600 species: mainly tropical, warm temp; some cultivated (Aristolochia , Asarum )
Reference: [Gregory 1956 Amer J Bot 43:110–122]



Perennial from horizontal rhizome at soil surface or deep, ± vertical rhizome, spreading or clumped, gingery-aromatic
Leaves basal or arising singly from rhizome, generally evergreen; blade cordate to reniform
Inflorescence: flower terminal, at ground level
Flower radial, generally dark colored; sepals 3, persistent, adherent into a tube or fused; stamens 12, free from style
Fruit: fleshy capsule
Seed with fleshy appendage, dispersed by ants
Species in genus: 90 species: n temp
Etymology: (Greek: derivation unknown)


A. caudatum Lindl.

Plant generally spreading, forming a loose mat; rhizome near soil surface, horizontal
Leaf: blade uniformly green
Inflorescence: peduncle ± horizontal
Flower: calyx tube inner surface white with single median red stripe, lobes 2–9 cm, ± spreading from tube in flower, long-tapered, maroon (rarely ± green); anther tip < pollen sac, dark
Chromosomes: 2n=26
Ecology: Moist places in forests
Elevation: 0–2200 m.
Bioregional distribution: Klamath Ranges, North Coast Ranges, San Francisco Bay Area
Distribution outside California: to British Columbia, Montana
A form with short, reflexed, tapered calyx lobes from KR (McCloud River) is separable from A. lemmonii by lobe taper
Horticultural information: IRR: 4, 5, 17 &SHD: 1, 2, 6, 7, 14, 15, 16, 18, 19, 20, 21, 22, 23, 24; GRCVR.

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