Crocanthemum rosmarinifolium
Crocanthemum corymbosum
rosemary frostweed
pine barren frostweed
ascending to erect, (13–)20–40(–51) cm, stellate-tomentose.
ascending to erect, 10–30(–50) cm, stellate-pubescent, glabrescent.
cauline and, sometimes, basal basal mat-forming;
petiole 1–3 mm;
blade obovate, 10–22 × 3–5 mm;
cauline: petiole 1–4 mm;
blade oblanceolate to narrowly lanceolate, 10–38(–48) × 2–5.5(–7.8) mm, margins revolute;
surfaces stellate-tomentose abaxially, stellate-pubescent adaxially, without simple hairs;
lateral veins obscure abaxially.
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.
axillary and terminal, solitary flowers or glomerules; chasmogamous flowers solitary, at tips of branches, overtopping cleistogamous, cleistogamous 2–7 per glomerule, flowering 1–3 months later than chasmogamous.
terminal, compound dichasia in corymbiform cymes; chasmogamous flowers 1–6 per dichasium, overtopping cleistogamous, cleistogamous 10–45 per dichasium, produced simultaneously.
10–22 mm;
bracts 3–7 × 0.5–1 mm.
6–15 mm, villous and stellate-pubescent;
bracts 2–7 × 0.2–1.2 mm.
flowers: outer sepals linear, 1.2–2.5 × 0.2 mm, inner sepals 2.5–4.3 × 1.3–2 mm, apex acute;
petals obovate, 4–6 × 3.5–5 mm;
capsules 2–3 × 1.4–1.8 mm, glabrous.
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.
flowers: outer sepals linear, 0.5–1 × 0.2 mm, inner sepals ovate, 1.5–1.8 × 1–1.5 mm, apex acute;
capsules 1.3–1.7 × 1–1.3 mm, glabrous.
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.
Crocanthemum rosmarinifolium
Crocanthemum corymbosum
Crocanthemum rosmarinifolium is easily distinguished from sympatric species by its slender leaves, relatively small petaliferous flowers, occasional basal leaves, and overall pale color. As noted by R. M. Harper over a century ago, it seems not to occupy natural habitats and is found primarily on roadsides. Populations in the Dominican Republic occur up to at least 2200 m.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
LA Plants
WildflowerSearch
iNaturalist
USDA Plants Database
