Geniostoma

Geniostoma rupestre var. ligustrifolium, from here.


Belongs within: Gentianales.

Geniostoma is a genus of about fifty species of small trees and shrubs found in south-east Asia and Australasia.

Characters (from Conn 1995): Small shrubs to small trees, rarely scrambling to semi-climbing. Branches terete, quadrangular or four-winged, variously hairy or glabrous. Stipules mostly intrapetiolar. Leaves simple, opposite, more or less petiolate or sessile. Inflorescences terminal or axillary, ramiflorous or cauliflorous, uniflorous, dichasial or pleiochasial, often umbelliform or glomerulate. Calyx, corolla and androecium pentamerous. Sepals united at base; inner surface of calyx often with colleters at base; lobes imbricate in bud, margin mostly fimbriate. Corolla campanulate to rotate, white; outer surface glabrous to shortly hairy; inner surface glabrous to densely pilose; lobes imbricate or contorted in bud. Stamens alternipetalous, attached to mouth of corolla tube, exserted, usually recurved after anthesis, glabrous or hairy; filaments mostly short; anthers bilocular, introrse, connective often extended to form apical appendage. Pistil variously hairy or glabrous; ovary bilocular; placentas axile with many amphitropous ovules; style mostly short; stigma clavate, ellipsoid to globular, sometimes more or less oblong, about as large as ovary. Capsule ellipsoid to globular, sometimes more or less oblong, rarely flattened-ellipsoid, bivalved, septicidal to subseptifragal, maturing to green, with or without a black-purple tinge, usually becoming brown-black when over-mature. Seeds embedded in juicy orange or red pulp, numerous, ellipsoid to subglobular, intruded on hilar side; surface mostly minutely papillose to areolate, brown to black, endosperm thick, fleshy; embryo small, straight.

<==Geniostoma
    |--G. sect. Geniostoma C95
    |    |--G. antherotrichum Gilg & Bened. 1916 C95
    |    |    |--G. a. var. antherotrichum [incl. G. arfakense Kan. & Hat. 1942] C95
    |    |    `--G. a. var. archboldianum (Merr. & Perry) Conn 1980 [=G. archboldianum Merr. & Perry 1942] C95
    |    |--G. leenhoutsii Conn 1980 C95
    |    |--G. randianum Merr. & Perry 1942 [incl. G. obtusum Merr. & Perry 1942] C95
    |    |--G. rupestre J. R. & Forst. 1776 [incl. G. stenophyllum Gilg. & Bened. 1916] C95
    |    |    |--G. r. var. rupestre (see below for synonymy) C95
    |    |    |--G. r. var. glaberrimum (Benth.) Conn 1980 [=G. crassifolium var. glaberrimum Benth 1857] C95
    |    |    |--G. r. var. ligustrifolium MM04
    |    |    |--G. r. var. moluccanum (Bl.) Conn 1980 (see below for synonymy) C95
    |    |    |--G. r. var. rouffaeranum Conn 1980 C95
    |    |    `--G. r. var. solomonense Conn 1980 C95
    |    |--G. trichostylum Conn 1980 C95
    |    `--G. weinlandii Sch. in Sch. & Laut. 1905 [incl. G. acutifolium Hiern 1909] C95
    `--G. (sect. Macrostipulare) umbellatum Conn 1980 C95

Geniostoma rupestre J. R. & Forst. 1776 var. rupestre [incl. G. acuminatissimum Gilg. & Bened. 1916, G. brassii Merr. & Perry 1942, G. caulocarpum Sch. 1905, G. dasyneuron Gilg. & Bened. 1916, G. psychotrioides Gilg. & Bened. 1916, G. pullei Cammerl. 1924, G. schlechteri Gilg. & Bened. 1916] C95

Geniostoma rupestre var. moluccanum (Bl.) Conn 1980 [=G. lasiostemon var. moluccanum Bl. 1850; incl. G. dallmannense Kan. & Hat. 1942] C95


REFERENCES

[C95] Conn, B. J. 1995. Loganiaceae. In Handbooks of the Flora of Papua New Guinea vol. 3 (B. J. Conn, ed.) pp. 132-188. Melbourne University Press: Carlton (Australia).

[MM04] Martin, N. A., & L. A. Mound. 2004. Host plants for some New Zealand thrips (Thysanoptera: Terebrantia). New Zealand Entomologist 27: 119-123.

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