Ocotea trichantha Baker
Creators: name: Werff, Henk Van Der
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Laurales
Lauraceae
Ocotea
Ocotea trichantha

description: 32. <i>Ocotea trichantha</i> Baker (Fig. 10) <i>Journal of the Linnaean Society</i> 22: 515 (1887). — Typus: <b>Madagascar</b>. Without further data, fls, <i>Baron 4373</i> (holo-, K; iso-, P [P00541637 (under erroneously <i>Baron 4979</i> in SONNERAT), P00541638]!). SELECTED SPECIMENS SEEN. — Centre, Ravin boisé dans l’Isalo au NW de Ranohira, <i>Service Forestier (Capuron) 28280</i> (MO, P[P01977641], TEF); Toliara, Forêt d’Analavelona, 1.5 km NO d’Andranoheza, <i>Randriantafika &amp; Rakotovao 227</i> (MO, P[P01977644]). DISTRIBUTION. — This species has been collected at Andiamanero (Ihosy), near Isalo and the Massif d’Analavelona at altitudes from 600-1300 m. PHENOLOGY. — Flowers: August, September, December; fruits: December. VERNACULAR NAMES. — Maroanaka (Bara dialect), varongy. DESCRIPTION Tree, to 25 m tall. Twigs terete, densely light brown-tomentellous, becoming glabrous with age; terminal buds densely tomentellous. Leaves alternate, firmly chartaceous, 5-9 × 2.5-5 cm, elliptic to broadly elliptic, base acute or obtuse, tip obtuse or acute, upper surface shiny, glabrous or with some hairs near base of midrib, lower surface dull, glabrous or with some scattered, small, appressed hairs; lateral veins 3-5, venation immersed on upper surface, raised on lower surface, domatia present, often several pairs on a leaf, consisting of rather shallow pockets, this sometimes with a fringe of hairs. Petioles 0.9-1.3 cm long, with similar indument as twigs. Inflorescences in axils of bracts close to terminal buds (sometimes appearing in axils of normal leaves, but on closer inspection along a leafless short shoot), densely pubescent, to 4 cm long. Flowers white. Tepals 6, pubescent on both surfaces, 1.5-2 mm long; stamens 9, 4-celled, filaments and anther dorsally pubescent, 1.5 mm long, filament shorter than anther; staminodia 3, stipitiform, pubescent. Ovary and inside of receptacle glabrous. Cupule deeply cup-shaped, 1.5 cm wide, 1.1 cm high, fruit ellipsoid, 2 × 1.5 cm. REMARKS This species can be recognized by its short, densely pubescent inflorescences, alternate, few-veined leaves (at times approaching the tripliveined condition) and the densely tomentellous twigs. Most collections of this species are sterile or with fruits; the description of the flowers is based on the collection <i>SF 28280 Capuron</i>. The presence of inflorescences in axils of deciduous bracts and not in axils of normal leaves, is unusual among <i>Ocotea</i> species in Madagascar, but occurs also in the related <i>O. malcomberi</i>. This species differs from <i>O. trichantha</i> in its much longer and less densely pubescent inflorescences. More similar to <i>O. trichantha</i> is <i>O. ivohibensis</i> sp. nov., which differs in its sparsely pubescent flowers, erect hairs on lower leaf surface and the reddish hairs covering the domatia.
description: Published as part of <i>Werff, Henk Van Der, 2013, A revision of the genus Ocotea Aubl. (Lauraceae) in Madagascar and the Comoro Islands, pp. 235-279 in Adansonia (3) (3) 35 (2)</i> on page 271, DOI: 10.5252/a2013n2a5, http://zenodo.org/record/5206484
description: {"references": ["BAKER J. G. 1886. - Further contributions to the Flora of Madagascar. Journal of the Linnaean Society 22: 441 - 536."]}