Annesorhiza filicaulis Eckl. & Zeyh.

Deciduous geophyte. Roots replaced periodically, clustered, 1 to 4, pencil-like, slightly and evenly fleshy. Leaves in basal rosette, sub-erect to spreading, dead or dying at time of flowering, 160-200 x 90-160 mm, 4-to 5-ternate; rachis and pinnae straight. Ultimate leaflets 2-or 3-sect; segments linear, 10-25 mm x ± 0.5 mm, concolorous, glabrous; margins slightly thickened, involute; midrib slightly prominent and extending into a sharp point. Synflorescences 0.6-1.0 m long, with terminal primary umbel subtended by 2 to 6 smaller, secondary and tertiary umbels; peduncle brownish, glabrous, nodes subtended by reduced scale-like peduncular bracts. Umbels compound, obtriangular in outline; involucral bracts 3 to 4, 2-4 mm long, narrowly oblong to lanceolate, acuminate, glabrous; rays 3 to 5 (7), 10-40 mm long at anthesis, unequal, sub-erect, glabrous; involucel bracts 4 to 6, 1.5-2 mm long, narrowly oblong, acuminate, glabrous, raylets 6 to 14, glabrous, 2-3 mm long at anthesis. Flowers hermaphroditic in terminal and secondary umbels, functionally male in tertiary umbels; calyx lobes 5, acute to obtuse; petals 5, yellow, elliptic, acuminate with tips inflexed, glabrous, resin duct unbranched; stamens 5, with anthers inflexed; ovary bilocular, glabrous; stylopodium narrowly conical; styles sub-erect to spreading. Fruits isodiametric, narrowly oblong to lanceolate in dorsal view, 5.0-6.5 mm x ca. 1.5 mm; mericarps homomorphic, glabrous, immaculate when dry; median and lateral ribs 3, equal, filiform to somewhat evident; marginal ribs 2, narrowly winged, straight, margins entire; vascular tissue observed at base of ribs only, somewhat dispersed; ribs with most cells lignified; commissural vittae 2; vallecular vittae 4; commissure narrow; carpophore bipartite; druse crystals present, scattered throughout mesocarp.