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).

MIRABILIS

FOUR O'CLOCK

Perennial, subshrub
Stem repeatedly forked, decumbent to erect
Leaf generally petioled
Inflorescence forked; calyx-like involucres densely clustered or solitary in axils, bell- to saucer-shaped; flowers 1–16 per involucre, blooming sequentially
Flower: perianth funnel- to bell-shaped, lobes 5; stamens 3–5, generally exserted; stigma ± spheric, generally exserted
Fruit ± round to club-shaped, smooth to 5-ribbed; wing 0
Species in genus: ± 60 species: Am, Himalayas
Etymology: (Latin: wonderful)
Fls open in evening, close in morning. Spp. intergrade; Hermidium , Oxybaphus sometimes segregated, but intergrade with other species; careful study needed. [Pilz 1978 Madroño 25:113–132]

Native

M. pumila (Standl.) Standl.


Stem trailing to ascending, < 5 dm, short-hairy, often glandular
Leaf: blade 2–6 cm, triangular to broadly ovate, fleshy, hairy like stems
Inflorescence: involucres in axils or narrow clusters, cup-shaped, densely glandular-hairy, enlarged and papery in fruit; bracts 5, 7–8 mm in fruit, ± 2/3 fused; flowers 3 per involucre
Flower: perianth 8–10 mm, broadly funnel-shaped, pale pink, hairy
Fruit ± 5 mm, club-shaped, shallowly wrinkled between 5 wide ribs
Ecology: Dry, rocky places
Elevation: 1400–2500 m.
Bioregional distribution: San Bernardino Mountains, San Jacinto Mountains, White and Inyo Mountains, Desert Mountains
Distribution outside California: to Nevada, New Mexico, nw Mexico
Flowering time: Jun–Aug
Synonyms: Oxybaphus p. (Standley) Standley
The concept for this species and M. oblongifolia in CA is tentative and is likely to change
Horticultural information: TRY.

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