Acaena pinnatifida

Ruiz & Pavón

Fl. Peruv. 1: 68, plate 104, fig. b. 1798

Selected by author to be illustrated
Synonyms: Acaena californica BitterA. pinnatifida var. californica (Bitter) Jepson
Treatment appears in FNA Volume 9. Treatment on page 324.
Click plate for higher resolution version.
Plants from branched woody caudex. Stems decumbent, becoming suberect, 1.5–5 dm (in fruit), 4 mm diam.; branches erect or leafy. Leaves (crowded at bases of stems); stipules absent; petiole to 4 cm; blade 3–15 cm, leaflets 6–10 per side, gray-green (at least on dried specimens), ovate, 4–10 mm, pinnatisect, lobes 3–7(–11), linear, margins revolute, apex penicillate (having a little brush or tuft of hairs at tips), abaxial surface sericeous, adaxial sparsely pilose. Scapes terminal, to 50 cm, 1.5–3 mm diam., sparsely pilose, proximal scape and leaf sheaths with multicellular hairs among 1-celled hairs, with (0–)2–3 cauline leaves to 10 cm. Inflorescences 15–35-flowered, interrupted spikes, (flowers crowded distally, 2–15 cm in flower, elongating to 50 cm in fruit); bracteoles leaflike to linear, ciliate. Flowers 6 mm diam.; sepals 4–5, elliptic, 3 mm, abaxially pilose, adaxially glabrous; stamens usually 4, filaments 2–3 mm, anthers dark red; stigma rose, laciniate. Fruiting hypanthia ovoid, 3–4 mm diam., surfaces tomentose, obscurely 4-angled, bearing 10–20 spines in longitudinal ranks, to 3[–4] mm, spines with retrorse hairs or barbs.

Phenology: Flowering Mar–Jun.
Habitat: Coastal grasslands, open rocky slopes, sand dunes, old roadsides
Elevation: 50–400 m

Distribution

V9 529-distribution-map.jpg

Calif., South America (Argentina, Chile).

Discussion

Herbarium records indicate occurrences of Acaena pinnatifida between Santa Barbara and Sonoma counties.

References

None.

Lower Taxa

No lower taxa listed.