Flora of North America species comparison

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Crocanthemum scoparium

Bisbee Peak rushrose, broom rushrose, peak rockrose, peak rush-rose
Habit Subshrubs.
Stems

spreading to erect-fastigiate, 10–45 cm, usually sparsely stellate-pubescent to glabrate, sometimes densely lanate.
Leaves

cauline, tending to be deciduous in summer;

petiole 0–2 mm;

blade linear, 5–11 × 0.5–2(–3.5) mm, surfaces stellate-pubescent to glabrate abaxially, sparsely stellate-pubescent to glabrate adaxially, lateral veins obscure abaxially.
Inflorescences

terminal, panicles or racemes; chasmogamous flowers 1–18 per panicle or raceme, cleistogamous 0.
Pedicels

2–6 mm, sparsely or not glandular-hairy;

bracts 2–4 × 0.3–0.5 mm.
Chasmogamous

flowers: outer sepals linear, 1.5–3.5 × 0.3 mm, inner sepals 3.5–5(–7.5) × 2–3 mm, apex acute to acuminate;

calyx stellate-pubescent, hairs to 1 mm;

petals obovate, 3–6 × 3–5 mm;

capsules 2.8–3.8 × 2–2.5 mm, glabrous.

Crocanthemum scoparium
Distribution
from FNA
CA; nw Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

Even with the recognition of Crocanthemum aldersonii and C. suffrutescens as separate species, morphological diversity within C. scoparium still remains considerable. The two varieties here recognized show differences in habit, average plant height, number of flowers, and distribution. Another variant occurs sporadically along the coast and on Santa Cruz Island, from Monterey to San Diego counties; vegetative parts (at least distal branches, pedicels, and sepals) are covered with white, lanate hairs. This variant has never been formally named. Another form from coastal Mendocino County was called “Helianthemum mendocinensis” by Alice Eastwood on a specimen (H. E. Brown 785, JEPS); the name was never published. These plants have densely stellate-pubescent stems and exceptionally elongate sepal tips.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Stems mostly 10–30 cm, divaricate and spreading or curved proximally and erect distally; mostly near-coastal.
var. scoparium
1. Stems usually 30–45 cm, usually erect-fastigiate, sometimes curved proximally and erect distally; mostly inland.
var. vulgare
Source FNA vol. 6, p. 407.
Parent taxa Cistaceae > Crocanthemum
Sibling taxa
C. aldersonii, C. arenicola, C. bicknellii, C. canadense, C. carolinianum, C. corymbosum, C. dumosum, C. georgianum, C. glomeratum, C. greenei, C. nashii, C. propinquum, C. rosmarinifolium, C. suffrutescens
Subordinate taxa
C. scoparium var. scoparium, C. scoparium var. vulgare
Synonyms Helianthemum scoparium
Name authority (Nuttall) Millspaugh: Publ. Field Mus. Nat. Hist., Bot. Ser. 5: 175. (1923)
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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