Pflanzenwissen · Art
Floribus, Aloe fragilis Lavranos & Roeoesli cognata est sed ab ista specie: habitu caulescente, caule 4 mm diam usque ad 35 cm longo, surculos emittente ad basim vel supra caulem; foliis alternis, raro rosulatis, brev…
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Floribus, Aloe fragilis Lavranos & Roeoesli cognata est sed ab ista specie: habitu caulescente, caule 4 mm diam usque ad 35 cm longo, surculos emittente ad basim vel supra caulem; foliis alternis, raro rosulatis, brevioribus, tenuioribus (5 mm) et 5 mm crassis, basi planis postea canaliculatis, praecipue differt. Plant perennial, herbaceous, caulescent growing in tuft, 8 - 15 stems per tuft; bulbils and roots on the lower leafless part of the stem; stem up to 35 cm long, 4 mm thick. Leaves up to 13 per stem, cauline, dispersed along the stem, spirally arranged, alternate, spreading, with sheath 1 cm long and with some reddish nerves; narrowly linear lanceolate, 5 - 14 cm long, 5 mm wide, ± 5 mm thick, apically ± obtuse with 2 - 4 white teeth; upper surface green, with many irregular white spots, generally flat at base and canaliculate higher up; lower surface convex with identical white spots; margin armed with small white teeth, 1 mm long, 1 - 5 mm apart; leaf exudate straw yellow on the fresh turning darker yellow when dry. Inflorescences simple, 1 per stem, 25 - 45 cm long, erect; peduncle slender and straight, green, 4 mm thick, the first half without sterile bracts, then 4 - 5 triangular acute bracts 6 X 4 mm, 3 cm apart, white, scarious, with a central brown nerve in the upper portion; raceme elongated 10 - 18 cm long, bearing 10 - 25 flowers loosely arranged and a tuft of sterile bracts at the top. Floral bract 5 X 3 mm, triangular, white, scarious, with a central greenish to maroon nerve, partly sheathing the pedicel. Pedicel 7 - 10 mm long, pink at base, becoming greenish white. Flowers slightly curved; perianth 25 X 4 mm, obconic at base to 3 mm, then nearly cylindrical, pink for the first 12 mm, then white with central green nerves at the apex. Outer tepals connate for half of the perianth length; filaments white, light yellow-green at the apex, curved above the ovary, then straight, included or as long as the perianth; style light yellow-green, included. Ovary 3 X 1.5 mm, olive-green. Fruit, a 6 X 5 mm globose and dehiscent green-grey capsule. Phenology. – February to April.
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Vorkommen (Status unklar)
Africa, Global, Madagaskar
Distribution and ecology. – “ In corruptis silvis, supra humu operta saxa, orientale litore; Antsirananae provincia; Prope Darainam vicum, inter nominata flumina Loky Manambatoque ”. The species is only known from three forest areas in the Daraina region between the Loky and Manambato rivers in northeast Madagascar. Only 45 - 50 individuals were observed among all these localities during a vegetation study of the region which included more than 54,000 records of plant occurrences in the ten main forest areas of the region over three consecutive years from 2003 - 2006. Aloe gautieri was observed between 350 and 550 m above sea level, in primary dry, sclerophyllous, mesophilous or even on the margin of ombrophilous forest, as well as in degraded dry vegetation or as a small shrub on ridges, but always near or on granitic rocks with little soil substrate, resulting in a water deficit during a part of the year. The canopies of the forests where it occurs reach up to 11 m, with a sparse shrub and treelet layer at 6 m high, and a very sparse suffrutescent layer reaching 1 m high. The most frequent species recorded together with Aloe gautieri in forest vegetation surveys are, in decreasing abundance: Mimusops cf. capuronii var. retusa Aubrév., Strychnos decussata (Pappe) Gilg, Rinorea longipes (Tul.) Baill. and Cleistanthus suarezensis Leandri. When observed in degraded dry vegetation, the species occurring with Aloe gautieri are Mascarenhasia lanceolata A. DC., Plectaneia thouarsii Roem. & Schult. and Peponidium cuspidatum Arènes.
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Conservation status. – Aloe gautieri is assigned a preliminary status of Vulnerable (VU D 2) following the IUCN Red List Categories and Criteria (IUCN 2012, calculation following CALLMANDER & al., 2007 and performed with MOAT, 2012). The new species has an “ Extent of Occurrence ” (EOO) of c. 100 km 2, an “ Area of Occupancy ” (AOO) of 27 km 2, and three subpopulations, only one of which is in the Loky-Manambato forests which holds a temporary protection status.