188 LILIACEJS. 



22. CLINTONIA, Rafinesque 



1. 0. uniflora, Knnth. Nearly stemless: peduncle shorter than the leaves, 1-2-ftow- 

 ered: perianth white, J-l in. long, pubescent. S. N. Mts. and Humboldt Bay, N. 



2. O. Andrewsiana, Torr. Flowers rose-red in a globose umbel on a stout peduncle, 

 often one or more smaller clusters below: fruit rich blue. In the redwoods. 



23. SCOLIOPUS, Torrey. 



1. 8. Bigelovii, Torr. Perianth -f in. long: sepals lanceolate, spreading, striped; 

 petals erect, very slender, dark: style branches 2-3 lines long. Redwood*. 



2. S. Halli, Wats. Smaller: style-branches a line long. Cascade Mts. 



24. TRILLIUM, Linnaeus. 



Flower sessile. Leaves sessile or nearly so, large 1 



Leaves long-petioled: stem 3-4 in. high 2 



Flower pedunoled. Leaves sessile or nearly so, rhombic-ovate 8 



Leaves on petioles 1-15 lines long, lanceolate 4 



1. T. sessile, L., var. Calif ornicum, Wats. Very variable: petals lurid-purple or 

 rose-red to white, 1-4 in. long. San Diego to Or. 



2. T. petiolatum, Pursh. Petioles exceeding or equaling the blade. Or. & Wash. 

 S. T. ovatum, Pursh. Flowers white becoming rose, fragrant. Santa Crux, N. 



4. T. rivale, Wats. Slender: leaves 1-2 in. long. N. W. CaL & &. W. Or. 



25. VERATRUM, Touraefort. 



Perianth-segments entire or serrulate, oblanceolate, thickened on the sides at base .,1,2 

 Perianth-segments fringed rhombic-ovate, the riged base divided by a narrow furrow. . 8 



1. V. Californicuxn, Durand. Stout, 3-7 ft. high: leaves L-12 in. long, sheathing: 

 panicle 1-2 ft. long: perianth-segments whitish with a greener brown-edged base. 



2. V. viride, Ait. Flowers green in slender panicles. Oregon, N. 



8. V. flmbriatum, Qr. Leaves lanceolate, 6-18 in. long, narrowed at base. CaL 



26. ZYGADENUS, Michaux. 



Flowers all perfect; segments longer than the stamens, the outer ones not clawed. .... 1 

 Flowers smaller: stamens equaling or exceeding the perianth, 2 or S lines long 2, 8 



1. Z. Fremont!, Torr. From a few inches to 3 or 4 ft. high: raceme simple or com- 

 pound: perianth rotate; segments - in. long, rather obtuse. San Diego to Humbt. 



2. Z. venenosus, Wats. Leaves rarely over 2 or 3 lines broad, usually folded: 

 raceme simple or nearly so. Cent. CaL, N. (Death Camau.) 



3 Z. paniculatus, Wats. Similar, stouter: raceme compound: lower flowers often 

 sterile, short pedioeled; segments 2 lines long, triangular, acute. CaL, E. 



