Jepson Herbarium
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Perennial, woody vine, [ shrub], rhizomed, aromatic.
Stem: branched, occasionally ± underground.
Leaf: simple, basal, cauline, or arising from rhizome, alternate; blade generally cordate, entire.
Inflorescence: flower generally 1, 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 ± or partly inferior, chambers generally 6.
Fruit: generally capsule.
Seed: many.
5–8 genera, ± 500 species: mainly tropics, warm temperate; some cultivated (Aristolochia, Asarum, Saruma). [Neinhaus et al. 2005 Plant Syst Evol 250:7–26] —Scientific Editors: Douglas H. Goldman, Bruce G. Baldwin.

Key to Aristolochiaceae

Rhizome shallowly horizontal or deeply ± vertical, plants spreading or clumped; roots gingery-aromatic.
Leaf: from rhizome, generally evergreen; blade cordate to reniform.
Inflorescence: flower terminal, at ground level.
Flower: generally dark colored; sepals forming tube, persistent; stamens 12, free from style, tips generally appendaged.
Fruit: fleshy capsule.
Seed: with fleshy appendage, ant-dispersed.
90 species: n temperate. (Greek: derivation unknown) [Kelly 2001 Syst Bot 26:17–53]

Plants generally spreading, forming loose mat; rhizomes near soil surface, horizontal.
Leaf: blade all green.
Inflorescence: peduncle reflexed in flower.
Flower: calyx lobes 0.8–1.5 cm, strongly reflexed in flower, obtuse to acute or abruptly pointed, red, tube white inside, generally not striped (or partial median stripe); stamen tip < pollen sacs.
2n=26. Shady wet places; 1000–1900 m. s High Cascade Range (Powellton, Butte Co.), High Sierra Nevada.

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].

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Bioregions in which taxon occurs	Red area (if present) is the part of the bioregion lying between the upper and lower elevation limits of the taxon; 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 have georeferencing or identification issues.
Chart based on elevation range in Manual and elevations and coordinates of CCH records. Data provided by the participants of the Consortium of California Herbaria. Note: About half of the CCH records include both elevation and coordinates.	Map made in collaboration with Scott Loarie. Data provided by the participants of the Consortium of California Herbaria. View all CCH records   CCH collections by month Duplicates counted once; synonyms included. Species do not include records of infraspecific taxa. Blue line denotes Manual flowering time.