Matelea trichopedicellata
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Ordo: Gentianales
Familia: Apocynaceae
Genus: Matelea
Name
Matelea trichopedicellata Krings & Morillo sp. nov. – Wikispecies link – IPNI link – Pensoft Profile
Latin
A new species in the Matelea stenopetala complex, most similar to M. hildegardiana, but differing in part by leaf bases broadly cuneate to rounded (vs. attenuate to narrowly cuneate in M. hildegardiana), pedicels coarsely pubescent, with only glandular capitate trichomes ubiquitous, eglandular trichomes not ubiquitous, rather in two lines, ca. 0.3 mm long (vs. both glandular capitate and eglandular trichomes ubiquitous, eglandular trichomes to 0.07 mm long in M. hildegardiana), and corollas rose, lobes 4.1–4.2 mm long (vs. corolla green, lobes 4.9–5.5 mm long in M. hildegardiana).
Type
BRAZIL. PARÁ: Rio Tocantins near Igarapé Cajazeirinha, approx. 30 km N of Itupiranga, 4°1'S, 49°21W, 1 Dec 1981 (fl & fr), D.C. Daly, R. Callejas, M.G. da Silva, E.L. Taylor, C. Rosario, & M.R. dos Santos 1619 (Holotype: NY!; Isotype: US!, MG, n.v., MO, n.v.).
Description
Slender, woody vine. Stems moderately to densely pubescent, pubescence in two lines, eglandular trichomes coarse, retrorse, ca. 0. 4 mm long, glandular capitate trichomes sparse, spreading, ca. 0.05 mm long. Leaf blades narrowly to broadly elliptic, 5.7–7.8 × 2.0–4.5 cm, with 5–8 pairs of lateral veins, adaxial surface glabrous, midvein glabrous or pubescent, eglandular trichomes antrorse or spreading, ca. 0.3 mm long, glandular capitate trichomes spreading, ca. 0.05–0.07 mm long, abaxial surface glabrous, midvein glabrous or pubescent, eglandular trichomes antrorse or spreading, ca. 0.3 mm long, glandular capitate trichomes spreading, ca. 0.05-0.07 mm long, apices acuminate, bases broadly cuneate to rounded, margins entire, colleters 2–4, lanceolate, 0.3–0.4 mm long; petioles 0.9–1.3 cm long, moderately pubescent, pubescence ubiquitous, eglandular trichomes mostly restricted to the adaxial ridge, spreading to antrorse-spreading, ca. 0.4 mm long, glandular capitate trichomes spreading, 0.05–0.07 mm long. Inflorescence racemiform, apparently 1–2-flowered (1 flower open at a time); peduncles to 2.4 mm long, moderately pubescent, pubescence ubiquitous, eglandular trichomes antrorse or spreading, 0.2–0.25 mm long, glandular capitate trichomes spreading, 0.05–0.07 mm long; pedicels 4.4–5.2 mm long, moderately to densely pubescent, eglandular trichomes in two lines, spreading, ca. 0.3 mm long, glandular capitate trichomes ubiquitous, spreading, ca. 0.05–0.07 mm long. Calyx lobes lanceolate, reflexed or spreading, 1.4–1.7 × 0.4–0.6 mm, adaxial surface glabrous, abaxial surface moderately to densely pubescent, eglandular trichomes antrorse or spreading, ca. 0.18 mm long, glandular capitate trichomes absent or very sparse, spreading when present, ca. 0.06 mm long, apices obtuse, margins entire; colleters 1 per sinus, lanceolate, ca. 0.18 mm tall. Corolla rose (fide collectoris), subcampanulate at base, tube ca. 0.9 × 0.9 mm, lobes imbricate in bud, linear-lanceolate to oblong, spreading, 4.1–4.2 × 1.9–2.0 mm, not ocellate, marginally or laterally recurved, adaxial surface pubescent, eglandular trichomes spreading, ca. 0.06–0.08 mm long, glandular-capitate trichomes absent, abaxial surface moderately pubescent, eglandular trichomes antrorse, 0.15–0.18 mm long, glandular capitate trichomes absent or very sparse, spreading when present, 0.03–0.04 mm long, apices obtuse, margins entire. Faucal annulus (corolline corona or Ca) absent. Gynostegial corona of fused staminal (Cs) and interstaminal (Ci) parts, C(is) on the surface of the corolla lobes, not subtended by a stipe, margin crenulate-lobate, Cs rising to meet the lower portion of the anther, rising segment more or less perpendicular relative to the base, ca. 0.4 mm tall, margin entire, base somewhat swollen, crenulate-lobate, ligule an apical ridge, not free, Ci unlobed, not ligulate. Style-head 1.6–1.7 mm diam, stipe 0.45–0.65 mm tall, terminal style-head appendage absent. Pollinarium: corpuscula ca. 0.18 mm long, caudicles present, pollinia narrowly ovoid, ca. 0.45 × 0.2 mm. Follicles ovoid-fusiform (imm), ca. 6 x 1.3 cm. Seeds unknown.
Distribution
Known only from the type, collected in the Brazilian Amazon, near Igarapé Cajazeirinha.
Ecology
Currently known only from terra firme forest.
Phenology
Collected in flower and fruit (imm) in December.
Etymology
The specific epithet refers to the conspicuously pubescent pedicels.
Conservation status
Currently, very little is known regarding the status of this species.
Discussion
Matelea trichopedicellata shares with Matelea hildegardiana (apparently endemic to the Gran Sabana, Bolívar, Venezuela), pubescent abaxial and adaxial corolla surfaces, but differs from it in part by leaf bases broadly cuneate to rounded and corolla lobes rose, 4.1–4.2 mm long (leaf bases attenuate to narrowly cuneate, and corolla lobes green, 4.9–5.5 mm long in Matelea hildegardiana). Matelea trichopedicellata and Matelea hildegardiana both exhibit eglandular trichomes on the abaxial corolla lobe surface in which the lowest cell is usually filled with a green or dark substance. The upper cells of the trichomes are usually translucent.
Original Description
- Krings, A; Morillo, G; 2012: Two new species in the Matelea stenopetala complex (Apocynaceae, Asclepiadoideae) from the Guiana Shield and Amazonian Brazil PhytoKeys, 17: 27-39. doi
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