Flora of North America species comparison

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Hibiscus martianus

heartleaf rose-mallow
Habit Subshrubs, to 1.5 m, herbage stellate-tomentose throughout, lines of fine curved hairs absent or obscured.
Stems

older twigs gray, glabrescent.
Leaves

stipules linear-lanceolate, (2–)3–7(–10) mm;

petiole subequal to blade, adaxial fine curved hairs absent or obscured;

blade markedly discolorous, broadly ovate, unlobed or shallowly 3-angulate-lobate, 2–8 × 2–8.5 cm, base cordate, margins irregularly dentate or dentate-serrate, apex broadly acute to rounded, surfaces densely tomentose abaxially, less so adaxially, inconspicuous nectary abaxially on midvein near base.
Inflorescences

solitary flowers in axils of distal leaves.
Pedicels

jointed below apices, 4–10 cm, exceeding subtending petioles, elongating in fruit;

involucellar bractlets (7 or)8–10, narrowly rhombic-elliptic, 1.2–2(–2.4) cm, enlarging in fruit, margins not or inconspicuously ciliate.
Flowers

horizontal or ascending;

calyx rotate to campanulate, lobed nearly to base, 1.4–2.4(–2.7) cm, larger in fruit, lobes narrowly triangular-ovate, apices acute to short-acuminate, nectaries absent;

corolla rotate to campanulate, petals bright red, asymmetrically obovate, 1.5–3 × 0.9–2.1 cm, margins ± entire, sometimes undulate, finely hairy abaxially where exposed in bud;

staminal column somewhat declinate, bright red, 0.9–1.4 cm, bearing filaments throughout, free portion of filaments secund, 1–5 mm;

pollen yellow-orange;

styles red, 2–7 mm;

stigmas red.
Capsules

yellowish brown, ovoid, 1.2–2 cm, apex apiculate, glabrous or with minute hairs near apex and on sutures.
Seeds

dark brown, angulately reniform-ovoid, 3–4 mm, stellate-hairy throughout.
2n

= 22 (Mexico: Nuevo León).

Hibiscus martianus
Phenology Flowering year-round.
Habitat Dry, often rocky thorn-scrub and open woodlands
Elevation 10–800 m (0–2600 ft)
Distribution
from FNA
TX; Mexico (Chihuahua, Coahuila, Hidalgo, Nuevo León, Puebla, San Luis Potosí, Tamaulipas)
[BONAP county map]
Discussion

In Texas, Hibiscus martianus occurs from the Big Bend region to the southernmost Gulf Coast, mostly in counties bordering or near the Rio Grande.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 6, p. 258.
Parent taxa Malvaceae > subfam. Malvoideae > Hibiscus
Sibling taxa
H. acetosella, H. aculeatus, H. biseptus, H. clypeatus, H. coccineus, H. coulteri, H. dasycalyx, H. denudatus, H. furcellatus, H. grandiflorus, H. laevis, H. moscheutos, H. mutabilis, H. poeppigii, H. radiatus, H. rosa-sinensis, H. schizopetalus, H. striatus, H. syriacus, H. trionum
Synonyms H. cardiophyllus
Name authority Zuccarini: Linnaea 24: 193. (1851)
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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