Alyxia

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Alyxia

Description

Climbers, scramblers or shrubs. Leaves opposite or in whorls of 3-7, more or less equal in size within a whorl but often of extremely different sizes and shapes on different parts of the plant; Inflorescences axillary and/or terminal, consisting of solitary flowers, of simple pleiochasia, or of compound pleiochasia and then sometimes forming large terminal panicles; Sepals ovate to linear; Stamens inserted mostly in the upper half of the corolla tube, more rarely around or just beneath the middle, not exserted from corolla throat; Ovules several. Fruit a pair of drupes from each flower, very frequently with one aborted, consisting of one or more articles with one seed in each article, when more than one then forming a moniliform chain; Seeds simple;

Distribution

Asia-Tropical, from North-East India through Southern China to Taiwan and southwards through Southeast Asia to Australia and eastwards through the Solomon Islands out into the Pacific west as far as Henderson Island and north to Hawaii present
106 species foundfrom North-East India through Southern China to Taiwan and southwards through Southeast Asia to Australia and eastwards through the Solomon Islands out into the Pacific west as far as Henderson Island and north to Hawaii. In Malesia there are 55 species. This is by far the largest genus of Apocynaceae s.s. in Malesia.

Taxonomy

More detailed notes for many of the species in this large genus can be seen in . Some species of Alyxia from outwith Malesia have been observed to have leaves that are remarkably different in shape between the older and younger growth. Although this has not been observed to the same extent in Malesian species many are known from relatively few collections and may well be present.

Citation

Pit. - in Lecomte, Fl. Indo-Chine 3. 1933: 1118
R.Br. - in Fl. Nouv. Caledonie. 1981: 100
G. Don - in Gen. Hist. 1837: 96
Boiteau - in Fl. Nouv. Caledonie. 1981: 98
Boiteau - in Fl. Nouv. Caledonie. 1981: 100
Spreng., Anleit. Kenntn. Gew., ed. 2. 1817: 494
A.DC. - in Prodr. 1844: 345
Roem. & Schult. - in Syst. Veg. 1819: 439
D.J. Middleton - in Fl. Thailand. 1999: 55
R.Br. - in PROSEA. 2001: 69
Pichon - in Mém. Mus. Natl. Hist. Nat. 1949: 164
D.J. Middleton - in Tree Fl. Sabah & Sarawak. 2004: 7
Kuntze - in Revis. Gen. Pl. 1891: 416
Benth. & Hook.f. - in Gen. Pl. 1876: 697
R.Br. - in Fl. Nouv. Caledonie. 1981: 100
R.Br. - in Blumea. 2000: 1
Boiteau - in Fl. Nouv. Caledonie. 1981: 98
Backer & Bakh.f. - in Fl. Java. 1965: 230
R.Br. - in Fl. Nouv. Caledonie. 1981: 101
K. Schum. - in Engl. & Prantl, Nat. Pflanzenfam. 4. 1895: 151