Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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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).

BOERHAVIA

SPIDERLING

Annual, perennial herb
Stem prostrate to erect; internode often with sticky area
Leaf petioled; blade 1–6 cm, paler beneath, often brown-dotted
Inflorescence openly branched; unit a raceme, umbel, or head; bracts 1–3, free, not forming an involucre
Flower: perianth < 30 mm, bell-shaped, closing by afternoon; stamens 1–5; stigma ± spheric, generally exserted
Fruit < 3.5 mm, club-shaped; ridges 4–5; wings 0
Species in genus: ± 30 species: warm regions. B. spicata Choisy (fruit ribs narrow, acute) is widespread in sw US, expected as agricultural weed near Mex border
Etymology: (H. Boerhaave, Dutch botanist, 1668–1738)

Native

B. triquetra S. Watson

Annual
Stem branched from base, ascending to erect, < 6 dm, slender, puberulent
Leaf: blade narrowly lanceolate to oblong, obtuse to acute
Inflorescence openly branched; peduncle 2–6 cm, slender; flowers 1–2
Flower 1–1.3 mm; perianth white to pale pink
Fruit 2–2.5 mm, glabrous; coarsely wrinkled between 3–5 wide, smooth, sharp ribs; tip truncate
Ecology: Sandy or rocky areas
Elevation: < 1600 m.
Bioregional distribution: e Peninsular Ranges (n base Santa Rosa Mtns), Desert Mountains (Little San Bernardino Mtns), Sonoran Desert
Distribution outside California: w Arizona, nw Mexico
Flowering time: Sep–Dec

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bioregional map for BOERHAVIA%20triquetra being generated
 
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Boerhavia triquetra
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