Jepson Flora Project: Jepson Interchange    

 
link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora.

POLYGONACEAE

BUCKWHEAT FAMILY

James C. Hickman

Annual to trees, some dioecious
Stem: nodes often swollen
Leaves simple, basal or cauline, alternate, opposite, or whorled, generally entire; stipules 0 or obvious and fused into a generally scarious sheath around stem
Inflorescence: small cluster, axillary or arrayed in cymes or panicles; involucres sometimes subtending 1–many flowers
Flower generally bisexual, small, ± radial; perianth generally 5–6-lobed, base ± tapered, often jointed to pedicel; stamens 2–9, often in 2 whorls; ovary superior, styles generally 3, generally fused at base
Fruit: achene, generally enclosed by persistent perianth, generally 3-angled, ovoid, and glabrous
Genera in family: 50 genera, 1100 species: worldwide, especially n temp; some cultivated for food (Fagopyrum ; Rheum , rhubarb; Rumex , sorrel) or ornamental (Antigonon , coral-vine; Muehlenbeckia ; Polygonum )
Reference: [Ronse Decraene & Akeroyd 1988 Bot J Linn Soc 98:321–371; Reveal et al. 1989 Phytologia 66(2–4):83–414]
Treatments of the 15 eriogonoid genera are based on the monographic work of James L. Reveal, who is gratefully acknowledged.

OXYTHECA

Annual, glandular, glaucous
Leaves basal; stipule 0; petiole indistinct; blade linear to obovate, hairy
Inflorescence open; bracts generally 3 per node, generally linear-lanceolate, generally fused at base, awned; involucre 1 per node, generally stalked, narrowly funnel-shaped to bell-shaped, teeth 3–36, awned; flowers 2–20 per involucre
Flower: perianth white to rose or pale yellow, hairy, lobes 6; stamens 9
Fruit golden-brown to dark brown. w North America., s South America
Etymology: (Latin: sharp box, from involucre)
Reference: [Ertter 1980 Brittonia 32:70–102]

Native

O. parishii Parry

Plant 5–60 cm
Leaf 1–7 cm, oblanceolate to widely obovate; margin ciliate
Inflorescence glandular on lower half of internodes; involucre funnel-shaped, glabrous; involucral bracts 4–36, 1.5–2 mm, generally > half fused (except awns), awns generally 2–5 mm; flowers 3–20 per involucre
Flower: perianth 2–2.5 mm, white to pink, generally strigose; lobes entire
Fruit 1.7–2 mm
Ecology: Dry, rocky or sandy soils
Elevation: 1300–2500 m.
Bioregional distribution: s Outer South Coast Ranges, Transverse Ranges.

Native

var. cienegensis Ertter

CIENEGA SECA OXYTHECA


Inflorescence: involucral awns 7–10, ivory, longest 3–5 mm
Ecology: Sandy, granitic places
Elevation: 2170–2450 m.
Bioregional distribution: eastern San Bernardino Mountains (Cienega Seca Creek, Coon Creek).
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for OXYTHECA%20parishii%20var.%20cienegensis 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 Oxytheca parishii var. cienegensis
Retrieve dichotomous key for Oxytheca
Retrieve multiple-entry key (MEKA) for Oxytheca
Overlay Consortium of California Herbaria specimen data by county on this map
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