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Watson's oxytheca, Watson's puncturebract

Habit Plants erect to spreading, 0.5–2.5 × 0.4–4 dm.
Stems

glandular throughout.

Leaf

blades spatulate or obovate to oblanceolate, 0.7–4 × (0.1–)0.5–1.2 cm, strigose adaxially, less so abaxially, sparsely glandular on both surfaces.

Inflorescences

open to densely branched, 0.5–2 dm;

bracts 1–5 × 0.5–3 mm, 3(–5) at first node and linear to ovate, otherwise distinct or basally connate and linear to triangular, ciliate and glandular;

awns 1–3 mm.

Peduncles

deflexed, stout, 0.2–0.5 cm at proximal nodes, sometimes absent.

Involucres

1.5–2 mm, typically glabrous, rarely with few scattered hairs abaxially;

teeth 4;

awns reddish, 2.5–3 mm.

Flowers

2–4(–7);

perianth white to pink, 1–1.5 mm, strigose and sparsely glandular abaxially;

tepals dimorphic, entire, those of outer whorl oval to ovate and strigose abaxially, those of inner elliptic to oval or ovate and glabrous or sometimes pubescent adaxially at base;

filaments 1–1.5 mm, glabrous;

anthers cream to red, oval, 0.2 mm.

Achenes

dark brown to maroon, 1–1.5 mm.

2n

= 40.

Oxytheca watsonii

Phenology Flowering Jun–Oct.
Habitat Sandy flats and slopes, saltbush communities
Elevation 1200-2000 m (3900-6600 ft)
Distribution
from FNA
CA; NV
[BONAP county map]
Discussion

Oxytheca watsonii is an uncommon species known only from scattered locations. The name was misapplied in pre-1980 California floras to Acanthoscyphus parishii var. goodmaniana.

(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. perfoliata
Synonyms Eriogonum cuspidatum
Name authority Torrey & A. Gray: Proc. Amer. Acad. Arts 8: 191. (1870)
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