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Flora of Australia Online

GENIOSTOMA

Geniostoma J.R.Forst. & G.Forst., Char. Gen. Pl. 23, t. 12 (1775); from the Greek geneion (a beard) and stoma (a mouth), alluding to the hairs in the throat of the corolla tube in the type species.

Type: Geniostoma rupestre J.R.Forst. & G.Forst.

Shrubs or small trees, rarely scrambling. Stems terete to 4-angled. Leaves petiolate to sessile; stipules interpetiolar or intrapetiolar. Inflorescences axillary, sometimes cauliflorous, variously cymose, (1–) few- to many-flowered, bracteate and bracteolate. Calyx united; tube short; lobes (4 or) 5, persistent. Corolla campanulate to rotate; lobes 5 (sometimes 6 in Geniostoma huttonii ) imbricate or contorted in bud; inner surface glabrous to throat densely pilose. Stamens 5, inserted near corolla mouth, exserted. Ovary 2 (or 3)-locular; ovules numerous, axile; style usually short; stigma club-shaped to globose. Fruit a capsule; valves 2, becoming recurved. Seeds embedded in a juicy, usually reddish, pulp. 

A genus of c. 25 species (or 40 if Labordia Gaudich. of Hawai’i is included), distributed from southern Japan through Malesia to Australia (Qld), New Zealand and across the Pacific to the Tuamotus, with one species reaching the Mascarene Islands. Two species are endemic on Lord Howe Is. 

B.J.Conn, A taxonomic revision of Geniostoma subg. Geniostoma (Loganiaceae), Blumea 26: 245–364 (1980).

Leaves 2–3 cm long; corolla tube 0.8–1 mm long; throat papillose, glabrous between filaments; filaments somewhat hairy at base

huttonii

Leaves (4–) 5.5–14 cm long; corolla tube 2–3 mm long; throat minutely hairy throughout; filaments glabrous

petiolosum

 

Data derived from Flora of Australia Volume 49 (1994), a product of ABRS, ©Commonwealth of Australia