Flora of North America species comparison

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Crocanthemum aldersonii

Alderson rushrose, Alderson's rush-rose
Habit Subshrubs.
Stems

erect, 30–65 cm, glabrate to sparsely stellate-pubescent.
Leaves

cauline;

petiole 0.5–1.5 mm;

blade linear, 10–21(–26) × 0.9–2 mm, surfaces stellate-pannose, lateral veins obscure abaxially.
Inflorescences

terminal, broad panicles, branches spreading, usually curved, stellate-pannose; chasmogamous flowers 1–3 per branch; cleistogamous 0.
Pedicels

5–13 mm, stellate-pubescent with no or sparse glandular hairs;

bracts 1–2.5 × 0.3–0.5 mm.
Chasmogamous

flowers: outer sepals linear, 1.3–2(–2.8) × 0.3 mm, inner sepals 4.7–7(–8) × 2–3 mm, apex acuminate or acute, calyx stellate-pubescent, hairs to 1 mm;

petals obovate, 8–12 × 6–8 mm;

capsules 3.5–4.3 × 2.3–2.7 mm, glabrous.

Crocanthemum aldersonii
Phenology Flowering Mar–Jun.
Habitat Chaparral on slopes and in canyons
Elevation 100–1200 m (300–3900 ft)
Distribution
from FNA
CA; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
Discussion

Crocanthemum aldersonii occurs from Orange and San Bernardino counties south into Baja California. Although traditionally placed within a broadly circumscribed C. scoparium, the tall habit, paniculate inflorescence, and acuminate to acute inner sepals of C. aldersonii are more similar to those of C. suffrutescens. The calyx of C. aldersonii occasionally has stellate hairs with thickened bases, a characteristic always present in C. suffrutescens. The tall inflorescence, curved inflorescence branches, and relatively large corollas are unique among Pacific slope species of Crocanthemum.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 6, p. 402.
Parent taxa Cistaceae > Crocanthemum
Sibling taxa
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. scoparium, C. suffrutescens
Synonyms Helianthemum aldersonii, H. scoparium var. aldersonii
Name authority (Greene) Janchen: in H. G. A. Engler et al., Nat. Pflanzenfam. ed. 2, 21: 305. (1925)
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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