Taxon Details: Thibaudia dudleyi Luteyn
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Narratives:
Family:
Ericaceae (Magnoliophyta)
Ericaceae (Magnoliophyta)
Scientific Name:
Thibaudia dudleyi Luteyn
Thibaudia dudleyi Luteyn
Primary Citation:
Brittonia 30: 428. 1978
Brittonia 30: 428. 1978
Accepted Name:
This name is currently accepted.
This name is currently accepted.
Description:
Description: Scandent shrub or high-climbing liana (fide label data); mature stems subterete to bluntly angled, smooth or striate, reddish-brown when dry, moderately short-white pilose or cinereous; bark thin, exfoliating into log strips, dark reddish-brown; immature twigs terete or bluntly angled, striate, densely short-white pilose or somewhat arachnoid. Leaves coriaceous, subamplexicaul, alternate, ovate, oblong or oblong-elliptic, (4-)7-10(-12.5) x (2-)3-7.5 cm, basally rounded or subcordate, apically obtuse or bluntly acute, entire, glabrous or sparsely above, moderately to densely pilose beneath with curly white hairs, and sparsely glandular-fimbriate beneath; pinnatinerved with 4-5 lateral veins which anastomose to form a marginal nerve, midrib and lateral nerves impressed above and raised beneath, veinlets impressed above and raised beneath but very obscure on both surfaces; petioles subterete, dark brown, 5-7 x 2.5 mm, densely short-white pilose. Inflorescence axillary, solitary, racemose, 10-20-flowered; rachis bluntly angled, densely appressed white pilose, 1-7 cm long and 3 mm in basal diam.; floral bracts ovate-lanceolate, obtuse, keeled, with prominent midrib, 3-4(-7) x 2 mm, sparsely short-white pilose, marginally glandular-fimbriate; pedicels terete, striate, arachnoid, 5-19 mm long extending to 26 mm after anthesis and 1.5-2 mm diam.; bracteoles similar to bracts but 2-6 mm long. Flowers with calyx 9-11 mm long; hypanthium barrel-shaped, 2.5-4 mm long, densely white pilose; limb spreading, 6-7.5 mm long including the lobes, densely short-white pilose but becoming sparsely pilose towards the lobes; lobes ovate or oblong-ovate, shortly acute, thinner at margin than in main body, 2.5-3.5 x 3.5 mm, sparsely short-white pilose externally and within; sinuses acute; corolla cylindric, double-layered, 6-9 x 5 mm, constricted at the throat, glabrous below becoming densely pilose distally, rosy-pink to red (fide label data), the lobes triangular acute, 1.5 mm long, very densely matted-pilose or lanate within, white; stamens 10, ca. 6 mm long; filaments connate (sometimes only in lower half), 2.5 mm long, with few long hairs along margins distally; anthers 4-5 mm long including the tubules; thecae 3 mm long, slightly granular near the base; style 7-8 mm long. Fruit unknown.
Distribution: Endemic to Peru.
Conservation status: Rare and endandered.
Key to the Varieties of Thibaudia dudleyi:1. Pedicels 5-7 mm long; bracteoles 2-3 mm long; rachis 1-2 cm long ............................ var. dudleyi
1. Pedicels 14-19 mm long; bracteoles 4-6 mm long; rachis 5-7 cm long ......................... var. pseudostellata
Description: Scandent shrub or high-climbing liana (fide label data); mature stems subterete to bluntly angled, smooth or striate, reddish-brown when dry, moderately short-white pilose or cinereous; bark thin, exfoliating into log strips, dark reddish-brown; immature twigs terete or bluntly angled, striate, densely short-white pilose or somewhat arachnoid. Leaves coriaceous, subamplexicaul, alternate, ovate, oblong or oblong-elliptic, (4-)7-10(-12.5) x (2-)3-7.5 cm, basally rounded or subcordate, apically obtuse or bluntly acute, entire, glabrous or sparsely above, moderately to densely pilose beneath with curly white hairs, and sparsely glandular-fimbriate beneath; pinnatinerved with 4-5 lateral veins which anastomose to form a marginal nerve, midrib and lateral nerves impressed above and raised beneath, veinlets impressed above and raised beneath but very obscure on both surfaces; petioles subterete, dark brown, 5-7 x 2.5 mm, densely short-white pilose. Inflorescence axillary, solitary, racemose, 10-20-flowered; rachis bluntly angled, densely appressed white pilose, 1-7 cm long and 3 mm in basal diam.; floral bracts ovate-lanceolate, obtuse, keeled, with prominent midrib, 3-4(-7) x 2 mm, sparsely short-white pilose, marginally glandular-fimbriate; pedicels terete, striate, arachnoid, 5-19 mm long extending to 26 mm after anthesis and 1.5-2 mm diam.; bracteoles similar to bracts but 2-6 mm long. Flowers with calyx 9-11 mm long; hypanthium barrel-shaped, 2.5-4 mm long, densely white pilose; limb spreading, 6-7.5 mm long including the lobes, densely short-white pilose but becoming sparsely pilose towards the lobes; lobes ovate or oblong-ovate, shortly acute, thinner at margin than in main body, 2.5-3.5 x 3.5 mm, sparsely short-white pilose externally and within; sinuses acute; corolla cylindric, double-layered, 6-9 x 5 mm, constricted at the throat, glabrous below becoming densely pilose distally, rosy-pink to red (fide label data), the lobes triangular acute, 1.5 mm long, very densely matted-pilose or lanate within, white; stamens 10, ca. 6 mm long; filaments connate (sometimes only in lower half), 2.5 mm long, with few long hairs along margins distally; anthers 4-5 mm long including the tubules; thecae 3 mm long, slightly granular near the base; style 7-8 mm long. Fruit unknown.
Distribution: Endemic to Peru.
Conservation status: Rare and endandered.
Key to the Varieties of Thibaudia dudleyi: