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three lobed oxytheca, three-lobed starry puncturebract, threelobe starry puncturebract

chickweed oxytheca, chickweed starry puncturebract

Habit Plants 0.7–5 × 0.7–6(–11) dm. Plants 1–2.5 × (0.3–)1–4(–5) dm.
Stems

erect or more commonly spreading to prostrate.

spreading to prostrate.

Leaf

blades spatulate to oblanceolate or linear, 1–5(–9) × 0.2–0.7(–2) cm.

blades spatulate to oblanceolate, 1–6(–8) × 0.3–1.2(–1.8) cm.

Inflorescences

open, 0.5–4 dm;

bracts mostly 2–8 × 1–3 mm, awns 0.8–1 mm.

diffuse, 0.5–2 dm;

bracts 3–8 × 0.5–1.5 mm, awns 0.2–0.5 mm.

Peduncles

erect to spreading, 0.5–1.5 cm, glabrous except sparsely glandular proximally.

erect, 0.1–1 cm, sparsely glandular or glabrous, otherwise absent.

Involucres

concolored, broadly turbinate, 3–8 mm, sparsely glandular;

teeth 5(–6), connate 1/3–1/2 their length;

awns greenish to reddish, 0.3–2 mm.

concolored, narrowly to broadly turbinate, 4–7 mm, sparsely glandular;

teeth 5(–6), connate ca. 1/2 their length;

awns greenish to reddish, 0.3–1 mm.

Flowers

3–5(–10);

perianth white to pink or reddish, 2.5–4 mm;

tepals oblong, 3-lobed apically 1/3–1/2 their length, lobes sometimes laciniate;

filaments 1–4 mm;

anthers red to maroon, ellipsoid to oval, 0.5–0.7 mm.

2–3;

perianth greenish yellow to reddish, 1–2 mm;

tepals broadly oblanceolate, 3-lobed apically 1/5 their length, lobes not laciniate;

filaments 0.8–1.2 mm;

anthers red, oval, 0.2–0.4 mm.

Achenes

golden-brown, 1.2–2 mm.

golden to red-brown, 1.2–1.5 mm.

2n

= 40.

= 40.

Sidotheca trilobata

Sidotheca caryophylloides

Phenology Flowering Apr–Sep. Flowering Jun–Sep.
Habitat Sandy flats, washes, slopes, chaparral communities, montane coniferous woodlands Sandy to gravelly flats, washes, and slopes, chaparral communities, montane conifer woodlands
Elevation 700-2100 m (2300-6900 ft) 1300-2600 m (4300-8500 ft)
Distribution
from FNA
CA; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Sidotheca trilobata occurs in the Transverse Ranges of southern California from Los Angeles and San Bernardino counties southward into northern Baja California, Mexico. It is the most commonly encountered species of the genus.

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

Sidotheca caryophylloides grows in the Transverse Ranges and the southern Sierra Nevada.

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

Source FNA vol. 5, p. 440. FNA vol. 5, p. 440.
Parent taxa Polygonaceae > subfam. Eriogonoideae > Sidotheca Polygonaceae > subfam. Eriogonoideae > Sidotheca
Sibling taxa
S. caryophylloides, S. emarginata
S. emarginata, S. trilobata
Synonyms Oxytheca trilobata, Eriogonum trilobatum Oxytheca caryophylloides, Eriogonum caryophylloides
Name authority (A. Gray) Reveal: Harvard Pap. Bot. 9: 211. (2004) (Parry) Reveal: Harvard Pap. Bot. 9: 211. (2004)
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