Crocanthemum corymbosum

(Michaux) Britton in N. L. Britton and A. Brown

in N. L. Britton and A. Brown, Ill. Fl. N. U.S., ed. 2, 2: 541. 1913.

Common names: Pine barren frostweed
Endemic
Basionym: Helianthemum corymbosum Michaux Fl. Bor.-Amer. 1: 307. 1803
Synonyms: Cistus corymbosus (Michaux) Poiret
Treatment appears in FNA Volume 6. Treatment on page 404. Mentioned on page 401.

Herbs or subshrubs. Stems ascending to erect, 10–30 (–50) cm, stellate-pubescent, glabrescent. Leaves cauline; petiole 1–5 mm; blade bicolor, obovate-elliptic to elliptic-lanceolate, 12–35 (–47) × 3–10 (–13) mm, base cuneate, apex obtuse, surfaces stellate-pubescent, lateral-veins raised abaxially. Inflorescences terminal, compound dichasia in corymbiform cymes; chasmogamous flowers 1–6 per dichasium, overtopping cleistogamous, cleistogamous 10–45 per dichasium, produced simultaneously. Pedicels 6–15 mm, villous and stellate-pubescent; bracts 2–7 × 0.2–1.2 mm. Chasmogamous flowers: outer sepals spatulate-linear, 2.4–4.5 × 0.7–1.2 mm, apex obtuse, inner sepals 3–7 × 2.5–3.6 mm, apex acute to acuminate; petals obovate, 6–11 × 5–9.5 mm; capsules 3.6–5.4 × 3–4 mm, glabrous. Cleistogamous flowers: outer sepals linear, 1.8–3 × 0.3–0.9 mm, inner sepals ovate, 2.2–4.8 × 1.2–3 mm, apex acute; capsules 1.6–3.8 × 1.4–3 mm, glabrous.


Phenology: Flowering late Feb–Apr.
Habitat: Stable maritime dunes, maritime forests, sandy pinelands, live-oak woodlands
Elevation: 0–50 m

Distribution

V6 763-distribution-map.jpg

Ala., Fla., Ga., Miss., N.C., S.C.

Discussion

Crocanthemum corymbosum is unique in Crocanthemum because of its corymbose inflorescence of long-pedicelled petaliferous flowers overtopping subsessile, apetalous flowers. Other species may produce long-pedicelled petaliferous flowers; the inflorescence shape is different. The two flower types develop synchronously, unlike in other species except C. glomeratum. The bicolored leaves, dark adaxially and pale abaxially, are a strong field and herbarium character.

Selected References

None.

Lower Taxa

None.
... more about "Crocanthemum corymbosum"
acute +  and acuminate +
Bruce A. Sorrie +
(Michaux) Britton in N. L. Britton and A. Brown +
cuneate +
Helianthemum corymbosum +
3.5 cm35 mm <br />0.035 m <br /> (4.7 cm47 mm <br />0.047 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
obovate-elliptic +  and elliptic-lanceolate +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.38 cm3.8 mm <br />0.0038 m <br />) +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Pine barren frostweed +
corymbiform +
Ala. +, Fla. +, Ga. +, Miss. +, N.C. +  and S.C. +
0–50 m +
connate +  and distinct +
cleistogamous +  and chasmogamous +
loculicidal +
Stable maritime dunes, maritime forests, sandy pinelands, live-oak woodlands +
umbellate +, thyrsiform +  and cymose +
racemose +, paniculate +  and corymbose +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.48 cm4.8 mm <br />0.0048 m <br />) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
stipulate +  and estipulate +
whorled +, opposite +  and alternate +
undulate +  and revolute +
linear +  and spatulate-linear +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (?) +  and 0.09 cm0.9 mm <br />9.0e-4 m <br /> (?) +
6-12-carpellate +, 5-carpellate +, 3-carpellate +  and 2-carpellate +
crassinucellate +  and bitegmic +
orthotropous +
stellate-pubescent +  and villous +
0.6 cm6 mm <br />0.006 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
crumpled +  and imbricate +
yellow +, white +, red +, purple +, pink +, dark red +  and green +
distinct +
6mm;11mm +
obovate +
0.5 cm5 mm <br />0.005 m <br /> (0.95 cm9.5 mm <br />0.0095 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Flowering late Feb–Apr. +
in N. L. Britton and A. Brown, Ill. Fl. N. U.S., ed. +
persistent +
30 cm300 mm <br />0.3 m <br /> (50 cm500 mm <br />0.5 m <br />) +
not dimorphic +
ascending +  and erect +
glabrescent +  and stellate-pubescent +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
3 +  and 1 +
sessile +  and petiolate +
stellate-pubescent +
Cistus corymbosus +
Crocanthemum corymbosum +
Crocanthemum +
species +
subshrub +  and herb +