Xyris thysanolepis

Primary tabs

Xyris thysanolepis


Slender, solitary to cespitose, soft-to-firm-based, perennial, 20-100 cm high, stems short or elongateto 6 cm. Leaves erect or in fans, 10-30 cm, sheath ciliate or not, tan to castaneous, upwards pink, brown or stramineous, smooth, eligulate, keel smooth to ciliolate, blade strongly flattened, 2-5 mm wide, margins thin, entire or ciliolate. Scapes distally subterete or oval, 1-2 mm widewith 1, 2 or more ribs, one strong, often making an edge, ciliate to densely ciliolate-scabridulous, otherwise smooth; spikes broadly ellipsoid becoming broadly obovoid to globose, 0.7-1.3 cm, bracts in a spiral, firm, red-brown, without distinct dorsal area but broadly and friably red-bordered, empty bracts few, smaller than and grading upward into the flowering ones, these broadly oblong to obovate, 6-8 mm, back convex or somewhat keeled near apex. Lateral sepals up to 1/3 connate or some pairs free, subequilateral, 6-7 mm, the narrow curved keel rusty-ciliolate to low-serrulate-lacerate from about middle to apex; petals elliptic to obovate, 4-5 mm; staminodes bearded; anthers 1.5-2 mm. Capsule 3.5-4 mm, placentation basal, valves eseptate; seeds numerous, cylindric-fusiform, ca. 1 mm, amber.


Guyana present, Mt. Roraima on the Venezuelan side present, S Amazonas present, S Bolivar present, Southern America: Venezuela (Venezuela present)
S Amazonas E through S Bolivar, Venezuela in medium- to high-elevation boggy savanna, particularly along small streams and in rocky flushes, and E (?) to Guyana. As some material has been collected within sight of Mt. Roraima on the Venezuelan side, it is likely that the species will be found on the Guyana side.


X. thysanolepis is part of a complex now being considered to include an Andean species. At present, however, it is treated as having two varieties, both of which could be found in Guyana, thus both considered below: