Crocanthemum greenei

(B. L. Robinson) Sorrie

Phytologia 93: 270. 2011.

Common names: Island rushrose
Conservation concernEndemic
Basionym: Helianthemum greenei B. L. Robinson in A. Gray et al., Syn. Fl. N. Amer. 1(1,1): 191. 1895,
Treatment appears in FNA Volume 6. Treatment on page 406. Mentioned on page 401.

Subshrubs. Stems erect, 15–30 cm, sparsely to densely stellate-pubescent, distally with dense, dark, glandular-hairs 0.4–0.8 mm. Leaves cauline; petiole 0–2.5 mm; blade oblanceolate to linearlanceolate, 7–25 (–35) × 2–4 (–7) mm, margins nonrevolute, surfaces stellate-pubescent, lateral-veins obscure abaxially. Inflorescences terminal, corymbose; chasmogamous flowers 3–25 per corymb, cleistogamous 0. Pedicels 1–4 (–6) mm, stellate-pubescent and densely glandular-hairy; bracts 3–10 × 0.5–1.5 mm. Chasmogamous flowers: outer sepals lanceolate, 2.5–4 × 0.5–1 mm, inner sepals 4.5–8 × 3–4 mm, apex acuminate; calyx strigose (sometimes also short-stellate-hairy), hairs simple, 1–1.7 mm; petals obovate, 5–8 × 3–4 mm; capsules 4.3–6 × 3–3.5 mm, glabrous.


Phenology: Flowering Apr–May.
Habitat: Dry, rocky ridges
Elevation: 10–100 m

Discussion

Crocanthemum greenei has been documented from San Miguel, Santa Catalina, Santa Cruz, and Santa Rosa islands. According to the California Native Plant Society, it is extant on Santa Catalina, Santa Cruz, and Santa Rosa islands, totaling about 20 populations and listed federally as threatened. Threats are from non-native mammals and plants. The habit, dense, dark glandular hairs on stems and pedicels, and long, white hairs on the calyx distinguish C. greenei.

Selected References

None.

Lower Taxa

None.
... more about "Crocanthemum greenei"
acuminate +
Bruce A. Sorrie +
(B. L. Robinson) Sorrie +
Helianthemum greenei +
oblanceolate +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.43 cm4.3 mm <br />0.0043 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
Island rushrose +
10–100 m +
connate +  and distinct +
chasmogamous +  and cleistogamous +
loculicidal +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
Dry, rocky ridges +
0.1 cm1 mm <br />0.001 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
umbellate +, thyrsiform +  and cymose +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
stellate-pubescent +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
stipulate +  and estipulate +
whorled +, opposite +  and alternate +
2.5 cm25 mm <br />0.025 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
stellate-pubescent +
undulate +  and revolute +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (?) +  and 0.1 cm1 mm <br />0.001 m <br /> (?) +
6-12-carpellate +, 5-carpellate +, 3-carpellate +  and 2-carpellate +
crassinucellate +  and bitegmic +
orthotropous +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
glandular-hairy +  and stellate-pubescent +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
crumpled +  and imbricate +
yellow +, white +, red +, purple +, pink +, dark red +  and green +
distinct +
obovate +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0 cm0 mm <br />0 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Flowering Apr–May. +
persistent +
Conservation concern +  and Endemic +
not dimorphic +
stellate-pubescent +
15 cm150 mm <br />0.15 m <br /> (30 cm300 mm <br />0.3 m <br />) +
3 +  and 1 +
sessile +  and petiolate +
2.5 cm25 mm <br />0.025 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
stellate-pubescent +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Helianthemum subg. Lecheoides +
Crocanthemum greenei +
Crocanthemum +
species +