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Tên Khoa học: Aspidistra clausa N.Vislobokov
Tên tiếng Anh:
Tên tiếng Việt:
Tên khác:

MÔ TẢ CHUNG

Herbaceous perennial, rhizomatous, evergreen plant. Rhizome creeping, with very short internodes, epigeous, 0 5.4-7 [6.4] mm. Roots grey, 0 1.1-1.4 [1.3] mm, with 1-2-layered velamen, root hairs deciduous, endoderm 1- 2-layered, pericycle of cells with lignified walls. Rhizomes with regularly repeating units, each comprising ca. 4 distichously arranged cataphylls followed by a foliage leaf. Cataphylls oblong, up to 9 cm long, promptly withering and disintegrating. Foliage leaves distinctly divided into petiole and lamina. Petiole green, adaxially sulcate, 15-32 cm long, 0 2.2-3.2 [2.7] mm. Lamina light green, oblong, basally cuneate and distally acuminate, 26-41cm long, 2.8-4.5 [3.6] cm wide. The midvein somewhat prominent at lower surface. Peduncle (specialized reproductive shoot) white, purple spotted, 2.8-4.6 [3.7] cm long, 0 2.4-2.8 [2.5] mm, with 5-7 purple mottled, widely ovate, acuminate, 11.8-13.4 [12.7] mm long, 8.9 mm wide distichously arranged scale leaves. Flower solitary at the end of peduncle. Perigone 18-18.3 [18.2] mm long, 0 38.7-42.5 [40.5] mm; tube white with purple spots outside, purple inside, widely tubular, 12.9-14.6 [13.3] mm long, 0 14.6-15.1 [14.8] mm; lobes 8, purple mottled to completely purple at both sides, triangular-lanceolate, with appendages at the base; appendages purple, protruding to mouth of perigone tube, fimbriate, 2.1-2.8 [2.5] mm long. Stamens 8 (in the same number as perigone lobes), inserted at the middle of the perigone tube lower than stigma, at the radii of tepals; filaments with purple spots, cylindrical, 4 mm long, 0 1.3-1.5 [1.4] mm, anthers 2.4-2.5 [2.5] mm long, 1.4-1.8 [1.6] mm wide, introrse, pollen sacs positioned at lower side of connectives, connectives white. Pistil 11.7 mm high. Style white with purple spots, cylindrical, 4.8 mm long, 0 2.9 mm. Stigma white with purple spots at lower surface, purple with four white radial bifurcated crests at upper surface, highly convex (conical) at center, 7 mm high, 0 7-7.7 [7.4] mm, 4-lobed at margin, lobes emarginated at apex. Ovary inconspicuous, superior, 4-locular. Fruits grayish black, subspherical, 13-15.6 [14.7] mm long, 0 14-16.6 [15.3] mm, with short protuberances. A carpophore is absent.

Distribution:—The species is known only from the type locality.

Taxonomic relationships:—The new species resembles and probably closely relates to A. crassifila but differs in width of leaf blade (2.8-4.5 cm vs. 6-12 cm), perigone tube wide tubular vs. campanulate, appendages longer, filaments and connectives white with purple spots vs. completely purple, stigma conical vs. mushroom-shaped. Also flowers of A. clausa are somewhat similar to flowers of A. patentiloba Wan & Lu (1989: 99), but strongly differ in stigma shape and should not be considered as closely related species.

ẢNH

Aspidistra clausa N.Vislobokov.jpg at www.BotanyVN.com

Ảnh 1. Aspidistra clausa N.Vislobokov.jpg

 

PHÂN LOẠI KHOA HỌC
Giới: Thực vật
Ngành: Magnoliophyta
Lớp: Liliopsida
Bộ: Asparagales
Họ: Asparagaceae
Chi: Aspidistra

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