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CANNABACEAE HEMP FAMILY

Alan T. Whittemore, except as noted

Tree, shrub, or erect or twining perennial herb; dioecious or flowers staminate and bisexual, wind-pollinated; epidermis with stiff hairs, glandular or not; sap watery. Leaf: petioled; simple, unlobed or palmately lobed or compound, all alternate or lower opposite. Inflorescence: terminal or axillary, unisexual or with both male and bisexual flowers. Flower: perianth parts 4–6, free or fused; stamens 0 or 4–6; ovary 0 or 1, superior, chamber 1, ovule 1, style 1, short, stigmas 2, slender, plumose. Fruit: drupe or achene, occasionally ± enclosed in persistent perianth.
11 genera, ± 100 species: temperate, tropical areas worldwide. [Sytsma et al. 2002 Amer J Bot 89:1531–1546] —Scientific Editors: Douglas H. Goldman, Bruce G. Baldwin.
Unabridged references: [Mitchell 1988 Bull New York State Mus Nat Hist 464:17–23]

Key to Cannabaceae

HUMULUS HOP

Alan T. Whittemore & Elizabeth McClintock

Annual, perennial herb, twining herbaceous vine, hairs occasionally forked. Leaf: lower opposite, palmately 3–5-lobed, upper alternate, unlobed. Staminate inflorescence: panicle, ± open. Pistillate inflorescence: head- or cone-like, generally pendent (erect). Pistillate flower: perianth parts fused into short, unlobed tube or ring, persistent. Fruit: enclosed in enlarged perianth subtended by papery bract.
2 species: northern temperate. (Probably latinized from Low German: hop)

Previous taxon: Celtis sinensis
Next taxon: Humulus lupulus

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Nov 27 2014
Citation for this treatment: [Author of taxon treatment] 2013. Humulus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=10304, accessed on Nov 27 2014

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