Citation: Vahl, Symb. Bot. 1:13 (1790).

Synonymy: Not Applicable

Common name: None

Description:
Semi-erect annual; stems, leaves and calyx with long to short simple unicellular hairs; leaves linear-elliptic to linear-obovate or suboblong, 2-7 cm long, 0.3-1 cm wide, short- to long-petiolate, the apex obtuse, the margin slightly revolute and undulate.

Inflorescence a usually branched cyme, circinnate; calyx not accrescent; corolla white with the throat yellow, outside with simple unicellular hairs, inside glabrous, subcylindrical with the lobes scarcely spreading, the tube c. 1-1.5 mm long, the limb c. 0.75 mm diam.; anthers free; style c. 0.2-0.5 mm long, the stigma with the stigmatic cone glabrous and c. 0.2 mm long.

Mericarps glabrous, 4, falling at maturity.

	Flowering branch, half flower and fruit.
Image source: fig. 539D in Jessop J.P. & Toelken H.R. (Ed.) 1986. Flora of South Australia (4th edn).

Distribution:  Grows in red sandy loams.   W.Aust.; N.T.; Qld. Conservation status: native Flowering time: Jan. — Dec.

SA Distribution Map based on current data relating to specimens held in the State Herbarium of South Australia

Biology: No text

Taxonomic notes: Pending a revision of the genus in Australia this species is treated here under the name used in earlier editions of Black's flora. The full synonymy is not given here but the correct name for H. undulatum is H. ramosissimum (Lehm.)DC. In the Flora of Central Australia the plant is treated under the name H. bacciferum, Forsskål; this species is distinct from H. ramosissimum. It is possible that the Australian plant may be neither of these but may represent a previously unrecognised endemic species.

Author: Not yet available