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A new species and a new combination in Phaeostemma (Apocynaceae, Asclepiadoideae, Gonolobinae).

Morillo G, Krings A - PhytoKeys (2014)

Bottom Line: Phaeostemma surinamensis Morillo & Krings, sp. nov., anew species of Apocynaceae (Asclepiadoideae, Gonolobinae) is described and illustrated, and the new combination Phaeostemma fucata (Woodson) Morillo & Krings, comb. nov., is made.The new species, known only from a lowland wet forest of Suriname, seems to be closely related to Phaeostemma fucata, which is an endemic to Ptari-tepui, a sandstone mountain in the southeastern edge of the Venezuelan Guayana.

View Article: PubMed Central - PubMed

Affiliation: Departamento de Botánica, Facultad de Ciencias Forestales y Ambientales, Universidad de Los Andes, Mérida 5101-A, Venezuela.

ABSTRACT
Phaeostemma surinamensis Morillo & Krings, sp. nov., anew species of Apocynaceae (Asclepiadoideae, Gonolobinae) is described and illustrated, and the new combination Phaeostemma fucata (Woodson) Morillo & Krings, comb. nov., is made. The new species, known only from a lowland wet forest of Suriname, seems to be closely related to Phaeostemma fucata, which is an endemic to Ptari-tepui, a sandstone mountain in the southeastern edge of the Venezuelan Guayana.

No MeSH data available.


Flower of Phaeostemma fucata (from Steyermark 59963, MO).
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Figure 1: Flower of Phaeostemma fucata (from Steyermark 59963, MO).

Mentions: Phaeostemma E. Fourn. (Apocynaceae, Asclepiadoideae, Gonolobinae) is a South American genus of twining vines, distributed from southeastern Venezuela to Argentina. Heretofore, five names have been published in the genus — Phaeostemma brandonianum Silveira, Phaeostemma glaziovii E. Fourn., Phaeostemma grandifolia Rusby, Phaeostemma riedelii E. Fourn. and Phaeostemma tigrina Woodson—however, based on morphology, neither Phaeostemma grandifolia [syn. Matelea dasytricha (Schltr.) Woodson] nor Phaeostemma tigrina appear to belong to Phaeostemma. The latter species appear to belong to the Andean lineage Lachnostoma Kunth (Morillo 2012). Members of Phaeostemma s.l. are recognized by stems, leaves and inflorescences densely pubescent, with brown to yellowish-red medium to long (0.9–3 mm) eglandular trichomes, mixed with some shorter (0.5–1 mm) eglandular, multiseptate trichomes, and in some species short (0.15–0.4 mm) glandular trichomes, leaves membranous to coriaceous, often broadly ovate, ovate-elliptic, elliptic or widely oblong, medium to large in size (8–19.5 × 3.8–12 cm), bases shortly cordate, flowers large and broadly campanulate (corolla 23–37 mm in diameter; Fig. 1), corollas green to greenish-yellow, lobes ovate to deltate, sometimes reticulate, spreading, not ocellate, gynostegium stipitate, nectar chambers present, anthers subtriangular almost horizontal, radially prominent, pollinia narrowly or triangular pearshaped, and staminal corona fleshy, of 5 digitate lobes, partly adnate to the stipe and to the corolla tube. Phaeostemma is somewhat similar to Lachnostoma,but in Lachnostoma, the pubescence is usually shorter, with short to long (0.12–1.60 mm) eglandular trichomes, and rarely short (0.10–0.25 mm) glandular trichomes, and corollas usually smaller (12–20 mm in diameter; 26–34 mm in Lachnostoma uribei (Morillo) Morillo, inedit.), with lobes in natural position ovate-oblong to narrowly ovate-elliptic, longer than wide, partly due to recurved margins, in few species as long as wide, and bases narrowly campanulate or subtubular (Fig. 2). Species of Lachnostoma are known only from wet mountain forests (usually above 1400 m) from the Andes of Peru, Ecuador and Colombia to the Costal Range of northern Venezuela, whereas species of Phaeostemma are known mainly from Tropical Rain Forests or in Austral Forests with araucarias (mostly below 1000 m), from southeastern Guayana to northern Argentina.


A new species and a new combination in Phaeostemma (Apocynaceae, Asclepiadoideae, Gonolobinae).

Morillo G, Krings A - PhytoKeys (2014)

Flower of Phaeostemma fucata (from Steyermark 59963, MO).
© Copyright Policy - creative-commons-attribution
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3921558&req=5

Figure 1: Flower of Phaeostemma fucata (from Steyermark 59963, MO).
Mentions: Phaeostemma E. Fourn. (Apocynaceae, Asclepiadoideae, Gonolobinae) is a South American genus of twining vines, distributed from southeastern Venezuela to Argentina. Heretofore, five names have been published in the genus — Phaeostemma brandonianum Silveira, Phaeostemma glaziovii E. Fourn., Phaeostemma grandifolia Rusby, Phaeostemma riedelii E. Fourn. and Phaeostemma tigrina Woodson—however, based on morphology, neither Phaeostemma grandifolia [syn. Matelea dasytricha (Schltr.) Woodson] nor Phaeostemma tigrina appear to belong to Phaeostemma. The latter species appear to belong to the Andean lineage Lachnostoma Kunth (Morillo 2012). Members of Phaeostemma s.l. are recognized by stems, leaves and inflorescences densely pubescent, with brown to yellowish-red medium to long (0.9–3 mm) eglandular trichomes, mixed with some shorter (0.5–1 mm) eglandular, multiseptate trichomes, and in some species short (0.15–0.4 mm) glandular trichomes, leaves membranous to coriaceous, often broadly ovate, ovate-elliptic, elliptic or widely oblong, medium to large in size (8–19.5 × 3.8–12 cm), bases shortly cordate, flowers large and broadly campanulate (corolla 23–37 mm in diameter; Fig. 1), corollas green to greenish-yellow, lobes ovate to deltate, sometimes reticulate, spreading, not ocellate, gynostegium stipitate, nectar chambers present, anthers subtriangular almost horizontal, radially prominent, pollinia narrowly or triangular pearshaped, and staminal corona fleshy, of 5 digitate lobes, partly adnate to the stipe and to the corolla tube. Phaeostemma is somewhat similar to Lachnostoma,but in Lachnostoma, the pubescence is usually shorter, with short to long (0.12–1.60 mm) eglandular trichomes, and rarely short (0.10–0.25 mm) glandular trichomes, and corollas usually smaller (12–20 mm in diameter; 26–34 mm in Lachnostoma uribei (Morillo) Morillo, inedit.), with lobes in natural position ovate-oblong to narrowly ovate-elliptic, longer than wide, partly due to recurved margins, in few species as long as wide, and bases narrowly campanulate or subtubular (Fig. 2). Species of Lachnostoma are known only from wet mountain forests (usually above 1400 m) from the Andes of Peru, Ecuador and Colombia to the Costal Range of northern Venezuela, whereas species of Phaeostemma are known mainly from Tropical Rain Forests or in Austral Forests with araucarias (mostly below 1000 m), from southeastern Guayana to northern Argentina.

Bottom Line: Phaeostemma surinamensis Morillo & Krings, sp. nov., anew species of Apocynaceae (Asclepiadoideae, Gonolobinae) is described and illustrated, and the new combination Phaeostemma fucata (Woodson) Morillo & Krings, comb. nov., is made.The new species, known only from a lowland wet forest of Suriname, seems to be closely related to Phaeostemma fucata, which is an endemic to Ptari-tepui, a sandstone mountain in the southeastern edge of the Venezuelan Guayana.

View Article: PubMed Central - PubMed

Affiliation: Departamento de Botánica, Facultad de Ciencias Forestales y Ambientales, Universidad de Los Andes, Mérida 5101-A, Venezuela.

ABSTRACT
Phaeostemma surinamensis Morillo & Krings, sp. nov., anew species of Apocynaceae (Asclepiadoideae, Gonolobinae) is described and illustrated, and the new combination Phaeostemma fucata (Woodson) Morillo & Krings, comb. nov., is made. The new species, known only from a lowland wet forest of Suriname, seems to be closely related to Phaeostemma fucata, which is an endemic to Ptari-tepui, a sandstone mountain in the southeastern edge of the Venezuelan Guayana.

No MeSH data available.