Mikania cordifolia
Mikania batatifolia
Florida keys hempvine
6-angled, gray-tomentulose or tomentose;
internodes 5–20 cm.
obscurely 6-angled, sometimes winged on angles, often densely glandular, glabrous or puberulent;
internodes 3.5–13 cm.
blades ovate to deltate, 5–10 × 3–8 cm, bases cordate, margins subentire to undulate-dentate, apices acute to acuminate, faces densely pilose to tomentose (abaxial paler than adaxial).
blades deltate-ovate, 1.5–6 × 1–5 cm, (subcoriaceous to somewhat fleshy) bases cordate to subcordate, margins usually hastately dentate to ± lobed (lobes divergent), apices acute to acuminate, faces glabrous (and gland-dotted).
25–55 mm, densely pilose to tomentose.
10–40 mm, glabrous, glandular.
white, 3.5–5 mm, lobes linear.
white, ca. 3 mm, gland-dotted, lobes deltate.
substramineous, elliptic to narrowly ovate, 6–8 mm, apices acute to slightly rounded.
lanceolate to narrowly ovate, ca. 3.5 mm, apices acuminate (abaxial faces puberulent).
7–10 mm.
4–6 mm.
brown, 3–4 mm, glabrous or pubescent, sparsely gland-dotted;
pappi of ca. 60 white, barbellate bristles 4–5 mm.
brown, 1.5–2 mm, densely gland-dotted;
pappi of ca. 40 white, barbellate bristles ca. 3 mm.
of heads compound-corymbiform (terminal and lateral), 6 × 7+ cm.
of heads corymbiform, 2–4 × 2–6 cm.
= 38.
Mikania cordifolia
Mikania batatifolia
Mikania cordifolia grows in all wet-tropical and subtropical America from northern Argentina to the lower Gulf Coastal Plain of the United States. It has the largest natural distribution of any species in the genus. In the tropics, M. cordifolia tends to be weedy, frequently occupying disturbed sites, usually in the lowlands. It is not weedy in the United States. In Louisiana, Mississippi, and Texas, M. cordifolia occurs in relatively open seeps and stream sides in beech (Fagus grandiflora Ehrhart) woods. It was collected in 1875 from the Navy Ballast Yard in Kargins Point, New Jersey (W. C. Holmes 1981); no further records for New Jersey are known.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
J. K. Small (1933), B. L. Robinson (1934), R. W. Long and O. Lakela (1971), and W. C. Holmes (1981, 1993) recognized Mikania batatifolia. Hn. Alain (1962) referred M. batatifolia to M. micrantha Kunth, a common, polymorphic taxon of humid American tropics. A. Cronquist (1980) merged M. batatifolia with M. scandens. In reexamining the members of the M. scandens complex, which includes M. batatifolia (Robinson), it is apparent that M. batatifolia is distinct. Differences with M. scandens, including chemical evidence, were cited by Holmes (1981). For additional information, see Holmes (1981, 1993).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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