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FNA | Family List | FNA Vol. 19, 20 and 21 | Asteraceae | Sphaeromeria

1. Sphaeromeria potentilloides (A. Gray) A. Heller, Muhlenbergia. 1: 7. 1900.

Fivefinger chickensage, cinquefoil false sagebrush

Artemisia potentilloides A. Gray, Proc. Amer. Acad. Arts 6: 551. 1866; Tanacetum potentilloides (A. Gray) A. Gray; Vesicarpa potentilloides (A. Gray) Rydberg

Perennials, 3–30 cm. Stems lax. Leaves basal and cauline; basal (20–70 mm) 2-pinnately lobed (ultimate lobes linear to filiform, ca. 1 mm wide); cauline (5–18 mm) usually pinnately lobed, faces silky-tomentose. Heads 2–20 in corymbiform to paniculiform arrays or borne singly. Involucres 2.3–5.2 mm. Phyllaries 8–10, hairy. ( Receptacles villous, hairs white, curly, 0.5–1 mm.) Cypselae 0.8–1.5 mm (faces obscurely nerved, becoming mucilaginous when wet).

Varieties 2 (2 in the flora): w United States.


1 Heads (3–)4–20; involucres 3–4(–4.5) mm; basal leaves 2-pinnately lobed   1a Sphaeromeria potentilloides var. potentilloides
+ Heads 1–3(–4); involucres 4–5.1 mm; basal leaves 1-pinnately lobed   1b Sphaeromeria potentilloides var. nitrophila


 

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