Chaenostoma macrosiphon Schltr.

Perennial herb eventually forming a small woody caudex, stems many from the base, c. 150-450 mm long, loosely to more closely branched, sprawling or decumbent and then rooting at the nodes, possibly sometimes erect, terete,-glandular-pubescent, hairs up to c. 0.1-0.25 mm long, brachyblasts present, closely leafy. Leaves opposite, bases connate forming a transverse ridge, largest primary leaves 6-30 x 1-5 mm, linear to narrowly elliptic, acute, margins often entire, rarely with up to 3 pairs of small callose teeth, plane to weakly revolute, glandular-puberulous as the stems. Flowers solitary in the axils of the uppermost leaves, the longest of these c. 3-15 x 0.7-3.5 mm, often becoming alternate, each terminal inflorescence 1-few-flowered, forming either racemes or narrow panicles. Pedicels (lowermost) 7-28 mm long. Calyx distinctly bilabiate, tube 2-3.5 mm long, posticous lobes 3-10 x 0.5-1 mm, anticous lobes slightly broader, glandular-pubescent, hairs up to 0.15-0.3 mm long, some glistening glands as well. Corolla tube 14-28 x 2-3 mm in throat, limb slightly bilabiate, 9-14 mm across, posticous lobes 3.2-6 x 2-4 mm, anticous lobe 3.2-6 x 2-4 mm, all broadly elliptic to oblong-elliptic, often mauve, sometimes white or tinged with pink, throat yellow, glandular-pubescent outside, hairs 0.15-0.3 mm long, inside well-bearded with clavate hairs in throat below the posticous lip. Stamens 4, anthers 1-1.5 mm long, anticous pair exserted, filaments 2-3 mm long, posticous pair included, filaments 1-2 mm long. Stigma 1.3-4 mm long, exserted. Style 12.5-25 mm long. Ovary 1.4-2 x 0.8-1 mm, glabrous. Capsules usually c. 5-9 x 2-2.5 mm, but an occasional tiny capsule present. Seeds c. 1 x 0.4 mm, pallid.