Crocanthemum aldersonii

(Greene) Janchen

in H. G. A. Engler et al., Nat. Pflanzenfam. ed. 2, 21: 305. 1925.

Common names: Alderson rushrose
Basionym: Helianthemum aldersonii Greene Erythea 1: 259. 1893
Synonyms: H. scoparium var. aldersonii (Greene) Munz
Treatment appears in FNA Volume 6. Treatment on page 402. Mentioned on page 401, 407, 408.

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.


Phenology: Flowering Mar–Jun.
Habitat: Chaparral on slopes and in canyons
Elevation: 100–1200 m

Distribution

V6 758-distribution-map.jpg

Calif., Mexico (Baja California).

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.

Selected References

None.

Lower Taxa

None.
... more about "Crocanthemum aldersonii"
Bruce A. Sorrie +
(Greene) Janchen +
Helianthemum aldersonii +
Alderson rushrose +
Calif. +  and Mexico (Baja California). +
100–1200 m +
Chaparral on slopes and in canyons +
Flowering Mar–Jun. +
in H. G. A. Engler et al., Nat. Pflanzenfam. ed. +
H. scoparium var. aldersonii +
Crocanthemum aldersonii +
Crocanthemum +
species +