Jepson Flora Project: Jepson Interchange    

 
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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

AMARANTHACEAE

AMARANTH FAMILY

James Henrickson

Annual to tree
Stem prostrate to erect
Leaves alternate or opposite, simple, generally entire, bract-like upward; stipules 0
Inflorescence: cymes, often arrayed ± in spikes or panicles; bracts 1–3 per flower, generally membranous-scarious, tip often short-pointed or spine-like
Flower generally small, uni- or bisexual, radial; sepals 0–5, fused at base or free, often ± scarious; petals 0; stamens 0–5, opposite sepals (staminodes sometimes alternating), filaments sometimes fused at base; ovary superior, 1-chambered, ovules 1–several, erect or pendent on ± basal stalks, styles 0–3, stigma head-like or 2–3-lobed
Fruit: utricle to circumscissile capsule
Seed lenticular to spheric, hard
Genera in family: ± 65 genera, ± 900 species: tropical, subtropical
Reference: [Robertson 1981 J Arnold Arbor 62:267–313]

TIDESTROMIA

Annual to subshrub, ± mounded; hairs short, branched
Leaves entire, often asymmetric, petioled; lowest alternate to opposite; upper opposite or whorled in 3's, generally reduced, larger falling early
Inflorescence: clusters of 1–5 flowers, axillary, sessile, subtended and ± enclosed by involucres of 2–3 bract-like leaves that become hardened; bracts scarious
Flower bisexual; sepals 5, 1–1.5 mm, 1-veined, glabrous inside, sometimes canescent outside, reflexed, inner scarious-margined; stamens 5, filaments fused below into a cup, alternate 5 short staminodes; ovary spheric, style 1, short, stigma head-like or 2-lobed
Fruit indehiscent; wall membranous
Seed obovoid, brown
Species in genus: 7 species: w North America deserts
Etymology: (Ivar T. Tidestrom, Swedish-born botanist of sw US, 1864–1956)

Native

T. oblongifolia (S. Watson) Standl.

Perennial 1–9 dm, < or = 15 dm wide
Leaves: upper, persistent leaves 2–4(8) mm; blade 10–30(65) mm, narrowly ovate to round, base ± obliquely wedge-shaped, persistently grayish white-canescent
Flower: sepals 1.3–1.7 mm; filament tube 0.2 mm, free filaments < or = 0.5 mm
Ecology: Common. Washes, rocky hillsides
Elevation: < 1200 m.
Bioregional distribution: Desert
Distribution outside California: Nevada, Arizona, n Baja California
Flowering time: Apr–Dec
Synonyms: subsp. cryptantha (S. Watson) Wiggins
Horticultural information: TRY; STBL only.

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