Paramomum S.Q. Tong
Acta Bot. Yunnanica, 7(3): 309 (1985)
The genus is similar to Costus in that leaves are spirally disposed, stamen is petaloid and anther affixed at the middle of the filaments, but differs in its open sheath and labellum not joined with the stamen at the base in a short tube, glands are epigynous.
A perennial herb, arising from a repent rhizome. The stem is erect, dilated at the base. Leaves are spirally disposed; blade is lanceolate or elliptic; sheath is not closed. Spike is ovate, scape rising from the base of the rhizome. Scales are sheathed; bracts are imbricate, bracteole is tubiforme and dehiscing laterally; tubular calyx is 3-toothed at the apex; tube of the corolla is tubulous and 3-lobed at the apex; stamina are petaloid; anthers are affixed at the middle of the filaments; lip is obovate with the stamen at the base not joined in the short tube; without a lateral staminode; the glands are epignyous; the ovary is 3-locular, with many ovules in each locule; styles are linear; stigma are infundibuliform. Capsule is semi-globous and crowned with a persistant calyx. Seeds are black and arillate.
Found only in tropical SW China.
One species, P. petaloideum. The taxonomic status of this monotypic genus may change with further analysis of the genus Amomum.
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