Rhaphidospora platyphylla (S.Moore) Bremek. ex A.R.Bean
Bean, A.R. (2017) Austrobaileya 10(1): 85.
Perennial tuberous herb to shrub, straggling or upright to about 1 m tall. Stems constricted above leaf nodes, longitudinally ribbed, glabrous or with eglandular hairs, and conspicuous cigar-shaped cystoliths (deposits of calcium carbonate) visible with a lens.
Leaves variable, lower leaves larger and on long petioles usually thinly winged to the base, leaves gradually reducing in size up the stems, and upper leaves on short petioles or +/- sessile, mostly glabrous or with white eglandular hairs. Leaf blades ovate, rhomboid to cordate, about 6-225 mm x 2.5-96 mm, petioles about 0-50 mm long though usually thinly winged to base, mostly glabrous or with sparse white hairs. Leaf base attenuate on large leaves to attentuate, rounded or caudate on smaller leaves; leaf apex acuminate to acute; margins crenate. Cigar-shaped cystoliths (deposits of calcium carbonate) visible with a lens on both surfaces but more onscure beneath. Midrib with a double ridge on the upper surface at least towards the base of the leaf blade. Lateral veins raised on the upper surface of the leaf blade. Pith rather copious.
Inflorescences axillary and terminal, usually a many-flowered dichotomously branched panicle often with a central axis, and axillary and young inflorescences appear as more simple 2-3-few-flowered dichotomously branched panicles. Peduncles with glandular and eglandular hairs. Bracts and bracteoles ca. 1.2-1.8 mm long. Calyx with 5 linear lobes, with glandular and eglandular hairs. Corolla tube 5-6 mm long, upper lip 2.7-3.5 mm long, lower lip with median lobe 4 mm long, lateral lobes 5.5 mm long; corolla outside hairy, inside glabrous. Stamens 2, filaments with a line of hairs otherwise glabrous, anthers lopsided and staggered, hairs present, the lower anther locule with a basal appendage to ca. 0.3 mm long. Ovary seated on a conspicuous disk, hairy. Style long and slender, stigma small and terminal.
Capsules +/- clavate, ca. 12 mm long, lower half constricted into narrow stalk, widened above into seed-bearing portion ca. 4.5 mm wide, hairy on the outer surface. Seeds light brown, flattened, ca. 2.8 mm diameter, up to four per capsule; testa clothed in pale brown spines. Radicle curved along the side of the cotyledons.
Features not available.
Description adapted from Barker (1996) J.Adel.Bot.Gard. Vol. 17: 151, and specimens at the Australian Tropical Herbarium.