|
(Last Modified On 10/15/2013)
|
|
|
|
(Last Modified On 10/15/2013)
|
|
Genus
|
Mascagnia Bert.
|
|
PlaceOfPublication
|
Hortus Ripul. 86. 1824.
|
|
Note
|
TYPE: Mascagnia americana Bert.
|
|
Description
|
Lianas. Leaves opposite, simple, entire, petiolate or subsessile with some glands, coriaceous, papyraceous or membranaceous; stipules small, at the base of the margin of the petiole. Inflorescences axillary or terminal, of pseudora- cemes, corymbs, or rarely umbels, these solitary or arranged in panicles; pedicels pedunculate; bracts and bracteoles conspicuous. Flowers with the sepals ovate or ovate-oblong, usually 4 sepals bearing glands, or rarely fewer or all 5 glandular; petals clawed, yellow, white, red, or violet, usually glabrous, sometimes seri- ceous dorsally, the limb ovate, obovate or suborbicular, the margin sinuate, cre- nate or fimbriate, the interior petal sometimes glandular; stamens 10, usually glabrous, only slightly unequal or the pair of lateral posterior stamens larger than the rest, the filaments united at the base, the anthers ellipsoid or somewhat ob- long; styles straight or somewhat sigmoid, glabrous or pubescent at the base, the apex truncate with the inner angle stigmatic, protruding or depressed, the pos- terior angle obtuse, acute or apiculate, the ovary trilobed, villose, hirsute or tomentose, rarely glabrescent. Fruit a schizocarp of 3 samaras, these with 1 lateral wing discoid, continuous around the seminiferous area or with 2 lateral wings shaped like butterfly wings, the seminiferous area also bearing a dorsal crest or narrow wings and sometimes also small supplementary wings or tubercles between the dorsal and lateral appendages; cotyledons almost equal, incumbent.
|
|
Habit
|
Lianas
|
|
Note
|
Mascagnia is a Neotropical genus of about 50 species
|
|
Distribution
|
ranging from Mexico to northern Argentina, but predominantly from Brazil.
|
|
Note
|
Its elevational range is from sea level to 1,000 meters or rarely as high as 1,500 meters. See Cuatrecasas (1958: 565-588) and Triana & Planchon (1862)
|
|
Key
|
a. Samaras with a single circular wing around the body, membranaceous, hyaline, radially nervate and veiny-reticulate; petals pink ...... 3. M. nervosa aa. Samaras with the main wing deeply divided into 2 divergent, opposite, lateral wings with parallel or subparallel divergent venation; petals yellow, purplish or reddish. b. Leaves densely appressed sericeous on the lower surface; petals yellow. c. Inflorescences profusely branched, axillary and terminal, much larger than the leaves and forming a large compound floribund cymose-paniculate thyrse, the branches robust, with conspicuous thickened nodes; lateral wings of samara acutely and deeply dentate along the outer margin, 15-23 mm long, the dorsal wing 1-3 mm high; leaves subcoriaceous with marginal glands, abaxially ochro- leucous sericeous; stems conspicuously sericeous 5a. M. sericans ssp. buricana cc. Inflorescences axillary, much shorter than the leaves with only a double cymose trifurcation, the short and slender branching with no conspicuous thickened nodes; lateral wings of samara obtusely sinuate along outer margin, 10-15 mm long, the dorsal wing absent; leaves membranaceous without marginal glands, abaxially cinereous sericeous with metallic shine; stems glabrous or nearly so ...... 1. M. dukei bb. Leaves sparsely pubescent, puberulous, or glabrous; petals yellow, purplish or reddish. d. Petals purplish or reddish ...... 6. M. violacea dd. Petals yellow. e. Lateral wings of samara thin membranaceous, broadly flabellate, 25-30 mm high, 25-35 mm broad, the medial wing 30 mm high ...... 2. M . hippocrateoides ee. Lateral wings of the samara subcoriaceous, thick and rigid at maturity, 5- 7 x 10-14 mm, broadly trapezoidal, obtusely undulate or crenate, the me- dial wing short, 1-2 mm high ...... 4. M. platyrachis
|
|
Tag
|
|
|
|
Project Name
|
|
Tag
|
|
|
|