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round-leaf puncturebract, roundleaf oxytheca

Habit Plants spreading, 0.6–2 × 0.5–4 dm.
Stems

glandular distally.

Leaf

blades spatulate to oblong or oblanceolate, 1–6 × 0.3–1.5 cm, margins ciliate, otherwise glabrous.

Inflorescences

open to densely branched, 0.8–1.7 dm;

bracts at first node 4–5, triangular to lanceolate, 2–10 × 0.5–4(–8) mm, with awn 0.5–1 mm, sparsely glandular, bracts at remaining nodes 3, forming an orbiculate to somewhat triangular perfoliate disk mostly 1–2.5 cm across, glabrous or glandular, with awn 1–3 mm, terminal bracts 0.5–2 × 0.1–0.4 mm, sometimes merely acerose, with awn 0.5–2 mm.

Peduncles

erect, stout, 0.3–0.8 mm at proximal nodes, sometimes absent.

Involucres

2–5 mm, glabrous or sparsely glandular abaxially;

teeth 4;

awns reddish, 2–3 mm.

Flowers

5–10;

perianth white or yellowish green to pink, 1.5–2.5 mm, echinulate and sparsely glandular abaxially;

tepals monomorphic, lanceolate to ovate;

filaments 1–1.5 mm, papillate basally;

anthers pink to red, oval, 0.2–0.5 mm.

Achenes

dark brown to maroon, 1.5–2 mm.

2n

= 40.

Oxytheca perfoliata

Phenology Flowering Apr–Aug.
Habitat Sandy to rocky flats, washes, and slopes mainly in saltbush communities
Elevation 600-1900 m (2000-6200 ft)
Distribution
from FNA
AZ; CA; NV; UT
[WildflowerSearch map]
[BONAP county map]
Discussion

Oxytheca perfoliata is basically a plant of the Mojave Desert, with extensions along the Lahontan Trough into northwestern Nevada (to Humboldt and Washoe counties), and along the desert edge of California’s Transverse Ranges and the more arid portions of the San Joaquin Valley. It also occurs in the Sonoran Desert south to Imperial County, California.

Oxytheca perfoliata is a food plant for the desert metalmark butterfly (Apodemia mormo deserti).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 5, p. 436.
Parent taxa Polygonaceae > subfam. Eriogonoideae > Oxytheca
Sibling taxa
O. dendroidea, O. watsonii
Synonyms Eriogonum perfoliatum
Name authority Torrey & A. Gray: Proc. Amer. Acad. Arts 8: 191. (1870)
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