Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
25. Saxifragaceae, the Saxifrage Family
3. Penthorum L. -- Ditch stonecrop
1. Penthorum sedoides L.
Erect, rhizomatous, perennial herb 1-6 dm tall, frequently red-tinged, glabrous
below, glandular-pubescent in the inflorescence. Leaves simple, alternate,
sessile or on petioles to 1 cm long; blades elliptic-lanceolate to oblanceolate,
2-10 cm long, 0.5-3 cm wide, acute to acuminate, rather finely serrate, cuneate
at the base. Flowers in terminal, branched scorpioid racemes; pedicels
0.5-3 mm long. Flowers star-shaped, perfect, regular, perigynous, 3-4
mm across in flower, 5-7 mm across in fruit; sepals 5, green, narrowly
triangular, 0.8-2 mm long, fused below to form a short, broad hypanthium; corolla
none; stamens 10; pistils 5, simple, fused toward the base and
laterally to form a ring, sharing a large, central axile placenta, each pistil
maturing into an obliquely circumscissile capsule; seeds numerous, tawny
to reddish-brown, ellipsoid, ca. 0.5 mm long, minutely papillate. Jul--Sep.
Stream banks, shores and ditches where water is fresh; frequent in e ND, e SD,
e and c NE; (ME to Man., s to FL and TX).
Previous Species -- Parnassia parviflora DC.
Return to Family -- Saxifragaceae -
The Saxifrage Family