Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
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NYCTAGINACEAE

FOUR O'CLOCK FAMILY

Richard Spellenberg

Perennial, shrub, tree, glabrous or hairy
Stem often forked
Leaves opposite, sessile or petioled, pairs generally unequal; blade generally entire
Inflorescence generally forked; of spikes, clusters, or umbels, each unit sometimes with a calyx-like involucre
Flower bisexual, radial; perianth of 1 whorl, petal-like, bell- to trumpet-shaped, base hardened, tightly surrounding ovary in fruit, lobes 4–5, generally notched to ± bilateral; stamens 1–many; ovary superior (appearing inferior because of hardened perianth base), style 1
Fruit: achene or nut, smooth, wrinkled, or ribbed
Genera in family: 30 genera, 300 species: warm regions, especially Am; some ornamental (Bougainvillea ; Mirabilis , four o'clock).

TRIPTEROCALYX

Perennial from large taproot
Stem much-branched
Leaf petioled; blade < 8 cm, fleshy, margin often wavy
Inflorescence: head; bracts 5–10, green, flowers blooming sequentially across head; receptacle flat to ± conic, studded with peg-like pedicels
Flower: perianth trumpet-shaped, nocturnal, lobes 4–5; stamens 3–5, included; stigma linear, included
Fruit: wings 3–5, wide, continuous above and below fruit body, thin, transparent, conspicuously net-veined
Species in genus: 3 species: arid North America
Etymology: (Greek & Latin: 3-winged cup, from fruit)
[Galloway 1977 Brittonia 27:328–347] Closely related to Abronia.

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