Bidens alba var. radiata (Sch.Bip.) F.Ballard ex Melchert
Melchert, T.E. (1975) Phytologia 32(4): 295.
Shepherd's Needles; Spanish Needles
Herb to shrub 60-200 cm tall. Stems 4-angled.
Inflorescence about 2.5 cm diam., flowers subtended by bracts about 4 mm long. Ray florets: About 5 per inflorescence, main lobe 8-veined, white, about 10 x 9, 2-3 -lobed but tubular at the base. Anthers nil. Ovary nil. Disk florets: Flowers 2-3 mm diam. Calyx, i.e. pappus, about 2 mm long. Corolla tube 2-5 mm long, lobes about 1 mm long. Anthers fused together, about 2 mm long, filaments about 3 mm long. Pollen orange-yellow. Ovary about 2 mm long, ovule solitary. Style about 5 mm long. Stigma hairy, about 2 mm long.
Features not available.