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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

POROPHYLLUM
Subshrub [annual, perennial herb]; strongly pungent-scented. Stem: erect. Leaf: simple, alternate or opposite; blade dotted with embedded oil glands. Inflorescence: heads discoid, peduncled, 1 or in ± leafy cyme-like clusters; involucre ± cylindric; phyllaries in 1 series, equal, free or fused at base, gland-dotted; receptacle flat, epaleate. Flower: corolla white to green-yellow or purple; style branches long, slender. Fruit: cylindric; pappus bristles 25–50+.
± 30 species: North America, South America. (Greek: pore-leaf, from gland-dotted leaves) [Strother 2006 FNANM 21:233–235] Porophyllum ruderale (Jacq.) Cass. var. macrocephalum (DC.) Cronquist (annual, leaves narrowly elliptic to ovate or obovate) collected as an agricultural weed in Seal Beach, Orange Co. (South Coast).
Unabridged references: [Johnson 1969 Kansas Univ Sci Bull 48:225–267]

Key to Porophyllum

1. Subshrub; leaves narrowly linear ..... P. gracile

1' Annual; leaves narrowly elliptic to ovate or obovate ..... [P. ruderale var. macrocephalum]

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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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