Difference between revisions of "Apocynum cannabinum"
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|genus=Apocynum | |genus=Apocynum | ||
|species=Apocynum cannabinum | |species=Apocynum cannabinum | ||
Latest revision as of 13:15, 24 November 2024
Herbs 3–10 dm. Stems glabrous or eglandular-pubescent. Leaves spreading to ascending; petiole 2–7 mm, often absent on lower leaves, glabrous or sparsely pubescent; blade ovate to lanceolate, 3–8(–11) × (0.4–)1.5–4 cm, mostly more than 2.5 times as long as wide, membranous, base rounded, cuneate, or auriculate, margins weakly to strongly revolute, apex acute to rounded or obtuse, usually apiculate, surfaces glabrous or densely eglandular-pubescent abaxially, glabrous or sparsely eglandular-pubescent adaxially. Inflorescences usually not exceeding foliage; peduncle 1–3.5 cm, glabrous or sparsely pubescent. Pedicels 2–3 mm, glabrous. Flowers: calyx lobes triangular-ovate to lanceolate, 1–2 × 0.3–0.8 mm, glabrous or infrequently pubescent; corolla white, greenish white, or yellowish white, glabrous abaxially and adaxially, tube 1.5–2.5 × 1.5–2 mm, ± as long as or slightly longer than calyx lobes, lobes erect or spreading, triangular-ovate, 1.5–2 × 0.7–1.2 mm. Follicles (40–)120–200 × 2–3 mm. Seeds 3.5–6 × 0.5–0.8 mm. 2n = 16, 22.
Phenology: Flowering summer–fall; fruiting summer–fall.
Habitat: Forests, woodlands, fields, lakeshores, margins of swamps, rocky or gravelly river margins, dry creek beds, roadsides, railroad rights-of-way, other disturbed sites.
Elevation: 10–2500 m.
Distribution
Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Ont., Que., Sask., Ala., Ariz., Ark., Calif., Colo., Conn., Del., D.C., Fla., Ga., Idaho, Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.C., N.Dak., Ohio, Okla., Oreg., Pa., R.I., S.C., S.Dak., Tenn., Tex., Utah, Vt., Va., Wash., W.Va., Wis., Wyo., Mexico (Baja California, Chihuahua, Coahuila, Nuevo León, Tamaulipas).
Discussion
Some American authors have treated plants with sessile or short-petiolate, lower cauline leaves and auriculate blades as Apocynum sibiricum Jacquin; these plants are here included in A. cannabinum.
Fiber derived from the stems of Apocynum cannabinum has long been considered to be of much higher quality than that of the other Apocynum species (S. Cheatham et al. 1995).
Selected References
None.