Common name. Mothplant. Family Asclepiadaceae.
Sometimes included in Apocynaceae. Subfamily Asclepiadoideae, Tribe Asclepiadeae.
Habit and leaf form. Lianas; laticiferous (with white latex). ‘Normal’ plants. Plants with roots (fibrous). Perennial. Leaves cauline. Young stems cylindrical. Climbing. Mesophytic. Leaves medium-sized; not fasciculate; opposite; not decurrent on the stems; ‘herbaceous’; not imbricate; petiolate. Petioles wingless. Leaves simple; epulvinate. Leaf blades dorsiventral (markedly discolorous); entire; flat; ovate; pinnately veined; cross-venulate; truncate. Leaf blade margins entire; flat.
Reproductive type, pollination. Fertile flowers hermaphrodite. Unisexual flowers absent. Plants hermaphrodite. Plants homostylous.
Inflorescence and flower features. Flowers aggregated in ‘inflorescences’; in cymes (in ‘fascicles’). Inflorescences simple; axillary; of 2–4 fascicles. Flowers pedicellate; medium-sized; regular; 5 merous; cyclic; tetracyclic. Free hypanthium absent. Hypogynous disk absent. Perianth with distinct calyx and corolla; 10; 2 -whorled; isomerous. Calyx present; 5; 1 -whorled; polysepalous (rarely), or gamosepalous; lobed; lobulate. Calyx lobes markedly longer than the tube. Calyx spreading; imbricate, or valvate; exceeded by the corolla; regular. Epicalyx absent. Corolla present; 5; 1 -whorled; appendiculate (with a corolline corona of 5 discrete lobes); gamopetalous; lobed; lobulate. Corolla lobes markedly longer than the tube. Corolla tubular (salverform); regular; cream to pink. Corolla lobes ovate (valvate). Androecium present. Androecial members definite in number. Androecium 5. Androecial members adnate (epipetalous); united with the gynoecium; all equal; coherent (connate); 1 -whorled. Stamens 5; all more or less similar in shape (not markedly capitate); isomerous with the perianth. Filaments appendiculate; connate into a tube, adnate to stigma. Anthers all alike; appendaged. The anther appendages apical. Pollen shed in aggregates; in tetrads. Gynoecium 2 carpelled. The pistil 2 celled. Gynoecium syncarpous; synstylous; superior. Ovary plurilocular; 2 locular. Gynoecium stylate. Styles partially joined (at the stylehead); apical. Stigmas 1; elongate-rostrate. Placentation axile. Ovules 30–50 per locule (‘many’); pendulous.
Fruit and seed features. Fruit 70–100 mm long; dehiscent; 1 locular (in 2 follicles, with one often aborting). Dispersal unit the seed. Seeds endospermic. Endosperm oily. Seeds compressed; conspicuously hairy (comose at micropylar end); with a tuft of hairs. Cotyledons 2.
Geography, cytology, number of species. World distribution: pantropical. Adventive. Australian states and territories: Western Australia, South Australia, Queensland, New South Wales, and Australian Capital Territory. 1 species naturalised in Australia. A genus of 3 species; A. sericifera Brot. Moth Vine; 0 endemic to Western Australia.
Additional comments. Named for A. de Araujo, a Prince of Portugal.
Additional characters Calyx with colleters (secreting mucilage) (at sinus bases). Annular corona absent. Corolline corona present; adnate to gynostegium (consisting of 5 discrete lobes adnate to base of staminal column and sides of corolla tube). Gynostegial corona absent. Corpusculum oblong, with flap of clear tissue at apex. Caudicles not winged; not geniculate. Pollinia in the anther locule pendulous; pellucid germinating mouth of pollinia absent. Pollen tetrads linear. Mature leaf blades bearing colleters (2 at lamina base).
Etymology. After A. de Araujo, a Prince of Portugal.
FloraBase is produced by the staff of the Western Australian Herbarium, Biodiversity and Conservation Science, Department of Biodiversity, Conservation and Attractions. Publication or other use of content on this site is unauthorised unless that use conforms with the copyright statement.
Western Australian Herbarium (1998–). FloraBase—the Western Australian Flora. Department of Biodiversity, Conservation and Attractions. https://florabase.dpaw.wa.gov.au/