Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
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VERBENACEAE

VERVAIN FAMILY

Dieter H. Wilken

Annual to tree, generally hairy
Leaves cauline, opposite, generally toothed; stipules 0
Inflorescence: raceme, spike, or head, generally elongated in fruit; bract generally 1 per flower
Flower bisexual; calyx generally 4–5-toothed; corolla 4–5-lobed, radial to bilateral, salverform to 2-lipped; stamens 4–5, epipetalous (if 4, generally in unequal pairs); ovary superior, 2- or 4-lobed, generally 2-chambered, style 1, often with 2 unequal lobes, only 1 stigmatic, lateral
Fruit: 2 or 4 nutlets, drupe-like, or capsule
Genera in family: ± 90 genera, ± 1900 species: especially Am tropical. Some cultivated (Clerodendron , Lantana , Verbena , Vitex ); some weedy worldwide (Lantana ); some used for wood (Tectona , teak).

PHYLA

Perennial, generally mat-like
Stem: central generally stolon-like; branches decumbent to erect, glabrous or ± strigose
Leaves opposite or clustered, strigose to appressed-hairy; hairs forked
Inflorescence: spike, ± spheric, becoming cylindric in fruit, dense; bracts ovate to wedge-shaped
Flower: calyx ± compressed, 2–4-toothed; corolla ± 2-lipped, tube generally > calyx; stamens 4, in unequal pairs; ovary 2-chambered, ovules 2, style lobes 2, stigma lateral
Fruit: nutlets 2
Species in genus: ± 15 species: warm temp, subtropical Am
Etymology: (Greek: clan or tribe, from clustered flowers)
Horticultural information: IRR or WET: 7, 8, 9, 10, 11, 12, 13, 14, 18, 19, 21, 22, 23 &SUN: 4, 5, 6, 15, 16, 17, 24 ; turf-like GRCVR; flowers attract bees.

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