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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.

 

SENNA

Martin F. Wojciechowski & Elizabeth McClintock


Perennial herb to tree, unarmed or main leaf axis a weak spine at tip or branches a weak thorn at tip. Leaf: even-1-pinnate, alternate; stipules small or not, ephemeral or not; leaflets 4–20(36). Inflorescence: axillary or terminal, raceme or panicle. Flower: generally ± bilateral, generally showy; sepals ± free; petals free, generally yellow; stamens free, 7 fertile, 3 sterile, or 10 fertile, anthers generally > filaments, opening by terminal pores. Fruit: dehiscent or not. Seed: few to many.
± 300 species: tropics, especially America, Africa, Australia, also warm temperate, deserts. (Arabic: Sana) [Randell & Barlow 1998 Fl Australia 12:89–138] Some cultivated as orns; dried leaves of some cathartic, laxative.
Unabridged references: [Irwin & Barneby 1982 Mem New York Bot Gard 35:1–918; Randell & Barlow 1998 Fl Australia 12:89–138]

Key to Senna

1. Perennial herb to subshrub; leaflets generally 4–18

2. Leaflets 4–8; gland(s) on main leaf axis between leaflet pairs; plant densely hairy ..... S. covesii

2' Leaflets 12–18; gland(s) near base of petiole; plant glabrous ..... [S. marilandica]

1' Shrub to small tree; leaflets generally 4–20

3. Shrubs of dry places; leaflets linear or generally ovate, generally flat, persistent or < 1 cm, ephemeral

4. Stem, leaf ± glabrous; leaflets 4–8, 4–6 mm ..... S. armata

4' Stem, leaf sparsely to densely hairy; leaflets 6–16, 10–25 mm ..... S. artemisioides

3' Shrubs to small trees generally not of dry places; leaflets oblong to elliptic, not ephemeral

5. Stipules 6–17 mm, ovate-cordate, generally persistent; uppermost, unopened flowers covered by bracts; fruit flat, dehiscent ..... S. didymobotrya

5' Stipules 3.5–7 mm, lanceolate, ephemeral; uppermost, unopened flowers not covered by bracts; fruit not flat, indehiscent ..... S. multiglandulosa

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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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