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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

SPHAEROMERIA

Timothy K. Lowrey & Elizabeth McClintock


Perennial herb or subshrub, generally aromatic, silky; hairs basally forked, attached off-center; herbage dotted with resin glands. Leaf: alternate, often crowded at base; entire or 3-lobed to 1–3-pinnately dissected. Inflorescence: heads disciform, 1–many; involucre hemispheric or bell-shaped; phyllaries graduated in 2–3 series, scarious-margined and -tipped; receptacle hemispheric, glabrous or hairy, epaleate. Pistillate flower: 4–15+, marginal; corolla narrowly tubular, lobes generally 3. Disk flower: 30–50; corolla tubular to bell-shaped; anther base rounded or ± cordate, tip awl-shaped to lanceolate or ovate; style tips truncate, brush-like. Fruit: cylindric, 2–3- or 5–10-ribbed; pappus generally 0 or a narrow crown of awl-shaped scales.
9 species: western North America. (Greek: sphere + division) [Lowrey & Shultz 2006 FNANM 19:499–502] Recent studies place Sphaeromeria in Artemisia (Garcia et al. 2011 Amer J Bot 98:638–653).
Unabridged references: [Holmgren et al. 1976 Brittonia 28:255–262]

Key to Sphaeromeria

1. Subshrub; leaves entire or 3–4-lobed; disk corolla yellow-white; receptacle glabrous ..... S. cana

1' Perennial herb from long, thick woody caudex; leaves 1–3-pinnately divided; disk corolla yellow; receptacle with white curly hairs 0.5–1 mm ..... S. potentilloides

2. Stems nearly leafless; basal leaves generally 1-pinnately divided; heads 1–3(4) ..... var. nitrophila

2' Stems leafy; basal leaves generally 2–3-pinnately divided; heads (3)4–20 ..... var. potentilloides

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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