Troglophyton tenellum Hilliard

A delicate erect (?) annual herb 30-100 mm tall, branching from the base, branches filiform, cobwebby, distantly leafy. Radical leaves, if present, 7-25 x 2.5-13 mm, half the length petiolar, cauline leaves subtending each dichotomy, 6-17 x 1.5-7 mm, sessile or nearly so, blade elliptic, tapering at both ends, apex acute or subacute, mucronate, both surfaces cobwebby. Heads heterogamous, campanulate, 2.5 x 2 mm, solitary on filiform leaf-opposed peduncles up to 15 mm long, peduncles becoming much shorter and corymbosely arranged towards the branchlet tips. Involucral bracts in 3 series, backs loosely woolly, tips slightly exceeding flowers, obtuse, slightly crisped, opaque milk-white, minutely radiating. Receptacle shallowly tubercled. Flowers 10-26, 6-14 ('female'), 6-16 ('bisexual'). Achenes 0.75 mm long, with duplex hairs. Pappus bristles many, about equalling corolla, tips subplumose with clavate cilia, shaft barbellate, bases cohering by patent cilia.