CRASSULACEÆ _Stone-Crop Family_ Fleshy smooth herbs with alternate leaves, and perfect flowers in terminal, oftentimes 1-sided cymes. Calyx 4—5-lobed; petals 4—5, distinct, stamens twice as many as the petals; carpels 4—5, styles short. [Sidenote: =Sedum stenopetalum= Pursh. _Narrow Petaled Stone-crop._] Perennial, tufted, smooth, flowering branches 3—7 inches long. Leaves alternate, crowded, sessile, linear ¼—½ an inch long, entire. Flowers bright yellow, nearly half an inch broad in a 5—7-forked, compact cyme, petals narrowly lanceolate, very acute. Common throughout the Rockies in moist, gravelly or sandy soil, on river shores, and on rocky slopes, flowering in June and July. PARNASSIACEÆ _Grass-of-Parnassus Family_ Smooth bog-herbs with a rosette of basal leaves and generally one or a few alternate stem leaves and solitary, terminal flowers. Flowers perfect; calyx generally 5-lobed to near the base; petals 5; perfect stamens 5; staminodia (imperfect stamens) in clusters at the base of each petal; stigmas 4. [Sidenote: =Parnassia fimbriata= Banks. _Fringed Grass-of-Parnassus._] Leaves tufted at the base on petioles 2—6 inches long; blades reniform or broadly cordate, ¾—½ an inch wide, thin, smooth, with about 7 principal veins. Flowers ¾ of an inch or more broad on a scape 8—12 inches high with a small cordate clasping bract about the middle; sepals ¼ of an inch long, elliptic, obtuse; petals obovate, pure white, fringed at the base, staminodia united into 5 fleshy obovate scales. Common throughout the region in springy places and damp mossy banks at the lower altitudes, flowering during July. [Illustration: Parnassia montanensis Rydb. & Fernald. (½ Nat.) Marsh Grass of Parnassus.] [Illustration: Ribes lacustre (Pers.) Poir. (¼ Nat.) Swamp Gooseberry.] [Sidenote: =Parnassia montanensis= Rydb. and Fernald. _Marsh Grass-of-Parnassus._] Leaves tufted at the base on short petioles, blades ovate with a cordate or rounded base ¾ of an inch long. Flowers solitary, on scapes 8 inches or more high with a large ovate bract below the middle; sepals lanceolate, acute, ¼ of an inch or more long, petals oval to elliptic only slightly larger than the sepals; staminodial scales with 7—9 gland-tipped filaments. Throughout the Rockies in marshy ground and shaded river shores; flowering in June and early July. [Sidenote: =Parnassia parviflora= DC. _Small-flowered Grass-of-Parnassus._] Scapes slender, 4—12 inches high, usually bearing a clasping oval leaf at the middle. Basal leaves on slender petioles, oval or ovate, narrowed at the base, not cordate, ½—1 inch long. Flowers about ⅓ of an inch broad, sepals equalling or somewhat shorter than the elliptic sessile petals; staminodia 5—7 at the base of each petal. In wet gravelly places at the lower altitudes throughout the Rockies; flowering in July. [Sidenote: =Parnassia Kotzebuei= Cham. and Schl. _Alpine Grass-of-Parnassus._]