Flora of North America species comparison

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Adenostoma fasciculatum

chamise, greasewood
Habit Plants decumbent or erect-ascending, 8–20 dm.
Stems

erect to arching;

young stem internodes brown, 2–6.5(–12) mm, glabrous or hirtellous-pilose, rarely glandular.
Leaves

crowded on short shoots;

stipules green, 0.5–1.5 mm on long-shoot leaves, smaller on fascicled leaves;

blade dark green, linear-oblanceolate, (2–)3–10(–13) × 0.6–1(–1.7) mm, apex acute, apiculate to obtuse, abaxial surface glabrous or hirtellous or villous, adaxial glabrous.
Inflorescences

of alternately branched pyramidal panicles, 3.5–10(–17) × 1–9(–15) cm or reduced to cylindric racemes or spikes, glabrous; subtending flower bracts 3-lobed, medial lobe largest;

bracteoles 2, subulate.
Pedicels

present, short.
Flowers

in clusters of 1–3(–7);

hypanthium green, 1.5–2.4 × 1–1.6(–2) mm, obscurely 10-veined, conspicuously so when dry, glabrous or weakly hirtellous, inner rims whitish;

sepals broadly ovate to semiorbiculate, 0.5–0.9 mm;

petals tardily falling, white, turning rusty, obovate-orbiculate, to 1–2 mm diam.;

stamens (10–)15, filaments 1–1.5 mm, anthers 0.4–0.8 mm;

ovaries obconic;

styles curved over ovary, erect distally, white, rarely pinkish distally, 1–1.4 mm.
Achenes

obovoid, 1.2–1.8(–2.4) mm, contained within hypanthium.

Adenostoma fasciculatum
Distribution
from FNA
CA; nw Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 3 (3 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Stems decumbent (plants low, mounded); insular.
var. prostratum
1. Stems erect-ascending, spreading (plants tall); mainland and insular
→ 2
2. Young stems glabrous, sometimes +/- hirtellous; leaves oblanceolate to linear, (2.5–)5–13 mm, apices acute-apiculate.
var. fasciculatum
2. Young stems pubescent to villous; leaves oblanceolate-clavate, 4–6.5 mm, apices usually obtuse.
var. obtusifolium
Source FNA vol. 9, p. 393.
Parent taxa Rosaceae > subfam. Amygdaloideae > tribe Sorbarieae > Adenostoma
Sibling taxa
A. sparsifolium
Subordinate taxa
A. fasciculatum var. fasciculatum, A. fasciculatum var. obtusifolium, A. fasciculatum var. prostratum
Name authority Hooker & Arnott: Bot. Beechey Voy., 139. (1832)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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