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white-margin starry puncturebract, white-margined oxytheca

chickweed oxytheca, chickweed starry puncturebract

Habit Plants 0.3–3 × 0.3–5 dm. Plants 1–2.5 × (0.3–)1–4(–5) dm.
Stems

spreading to prostrate.

spreading to prostrate.

Leaf

blades spatulate to oblanceolate, 1.5–7.5 × 0.4–1.5 cm.

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

Inflorescences

open, 0.2–3 dm;

bracts mostly 5–10 × 1–3(–5) mm, awns 1–2 mm.

diffuse, 0.5–2 dm;

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

Peduncles

erect, 0.5–3 cm, glandular.

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

Involucres

white-margined, broadly funnelform and laterally compressed, 4–8 × 9–12 mm, glabrous;

teeth 5, connate more than 3/4 their length, awns reddish, 1–1.5 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

3–6;

perianth white to pink, (2–)3–4.5(–5) mm;

tepals narrowly oblong, 3–5-lobed apically 1/3–1/2 their length, lobes laciniate;

filaments 3–5 mm;

anthers red, oval to oblong, 1–1.2 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, 1.8–2 mm.

golden to red-brown, 1.2–1.5 mm.

2n

= 40.

Sidotheca emarginata

Sidotheca caryophylloides

Phenology Flowering Feb–Aug. Flowering Jun–Sep.
Habitat Gravelly to rocky places, chaparral communities, montane coniferous woodlands Sandy to gravelly flats, washes, and slopes, chaparral communities, montane conifer woodlands
Elevation 1200-2500 m (3900-8200 ft) 1300-2600 m (4300-8500 ft)
Distribution
from FNA
CA
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Sidotheca emarginata grows in the San Jacinto and Santa Rosa mountains of Riverside County. The white-margined, papery involucre is a distinctive feature that might make the plant an attractive addition to an annual garden.

of conservation concern

(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. trilobata
S. emarginata, S. trilobata
Synonyms Oxytheca emarginata, Eriogonum emarginatum Oxytheca caryophylloides, Eriogonum caryophylloides
Name authority (H. M. Hall) Reveal: Harvard Pap. Bot. 9: 211. (2004) (Parry) Reveal: Harvard Pap. Bot. 9: 211. (2004)
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