Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
Parnassia L. -- Grass-of-Parnassus
Single or clumped, glabrous perennials. Leaves all basal except 1 sessile
leaf usually present near or below the middle on each scape, the blades entire;
petioles winged at the base by the elongate brownish stipules. Flowers
rather showy, white, solitary on the scapes; calyx usually adnate to
the ovary in the connate lower portion, the sepals acute to rounded; petals
white, strongly nerved; functional stamens 5, inserted on the hypanthium
opposite the sepals and alternating with 5 staminodes which are opposite the
petals, staminodes dilated from the base and divided into 3-many filamentlike
segments tipped with glandular knobs, shorter than to slightly exceeding the
functional stamens; pistil 4-carpellary, stigmas 4, sessile or nearly
so, ovary superior to slightly inferior; hypanthium very short. Capsule
4-valved, containing numerous oblong, angular seeds.
||Staminodes 3-parted; sepals with a narrow hyaline
||Staminodes (5)7- to many-parted; sepals herbaceous
||Leaf blades ovate to subrotund, broadly rounded
to usually cordate at the base, not decurrent on the petiole; bract-leaf
often clasping; petals 7- to 11-nerved.
||Leaf blades elliptic to elliptic-ovate, tapered
to and decurrent on the petiole; bract-leaf not clasping; petals usually
25. Saxifragaceae, the Saxifrage Family
2. Parnassia L. -- Grass-of-Parnassus
- 1. Parnassia glauca Raf.
- 2. Parnassia palustris L.
- 3. Parnassia parviflora DC.
Return to Family -- Saxifragaceae - The Saxifrage
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