18. Polygala saxicola Dunn, J. Linn. Soc., Bot. 35: 486. 1903.
岩生远志 yan sheng yuan zhi
Heterosamara saxicola (Dunn) Paiva.
Herbs erect or stoloniferous subshrubs, 5-10 cm tall. Stems and branches longitudinally angular, pubescent. Petiole ca. 5 mm, pubescent; leaf blade green, obovate or elliptic, 4.5-9 × 2.5-4.5 cm, papery, abaxially scabrous, glabrous, adaxially white setose, midvein raised abaxially, impressed adaxially, lateral veins 6 or 7 pairs, raised abaxially, anastomosing near margin, veinlets reticulate, raised abaxially, base broadly cuneate to subrounded, margin entire, apex obtuse-rounded, mucronate. Racemes 1-3, terminal, 3-6 cm, pubescent. Flowers crowded. Pedicel ca. 1 mm; basal bracteole 1, caducous, subulate, ca. 2.5 mm, apex long acuminate. Sepals 5, caducous, unequal; outer sepals 3, small, upper one boat-shaped, ca. 3.5 mm, on midvein winged on back, lateral ones elliptic, ca. 2.5 mm; inner sepals 2, petaloid, obovate or orbicular, ca. 7 × 5 mm, base unguiculate, apex rounded. Petals 3, connate in lower 1/2, pink to purplish, nearly equal, ca. 7 mm, apex with appendages 4-lamellate, yellow, and lobed. Stamens 8; filaments ca. 6 mm, lower 3/4 united, forming an open staminal sheath, and adnate with petals; anthers ovoid. Ovary ellipsoidal, ca. 2 mm, narrowly winged; style from base toward apex gradually thickened, curved, apex slightly lobed; stigma on lower lobe. Capsule orbicular or subsquare, ca. 5 mm in diam., winged, apex retuse and mucronate. Seeds black, ovoid, ca. 2 mm, ca. 1.2 mm in diam., white pubescent; strophiole white translucent, wing-shaped, ca. 2/3 as long as seeds. Fl. Mar-Apr, fr. Apr-May.
Damp rocks in forests on slopes, dry rocks on mountain ridges; 1200-2100 m. Guangxi, Yunnan [Vietnam].