172 CALOCHORTACE.\E 



flowers usually 2; petals obovate, about 4 cm. long; stamens tapering upwards, 

 but obtuse; very variable in coloration and hairiness of the jjetals. C. cyaneus, 

 C. bruneaunis, and C. maculosa^ A. Nels. Sage-brush plains: B.C. — ]\Iont. — 

 Ida. — Ore. Plain — Submont. Je-Jl. 



6. C. acuminatus Rydb. A low plant, 2-3 dm. high, bearing a bulblet 

 2—4 cm. above the bulb; leaves ver\' narrow, involute and curved, 3-15 cm. long; 

 flowers 1-2; petals obovate, about 3 cm. long; gland broadly oblong; anthers 

 gradually tapering upwards, obtuse. On drj^ hillsides: Mont. — Utah — Colo. 

 Submont. — Mont. Je-Au. 



7. C. Gunnisonii S. Wats. A strict plant, 2-5 dm. high, without bulblet; 

 leaves several, slender, mostly involute, 5-15 cm. long; flowers 1-2; petals broadly 

 cuneate-obovate, 2-4 cm. long, white or cream-colored, tinged and streaked with 

 purple, yellow and purple-dotted around the gland; capsule narrowed at both 

 ends, about 3 cm. long. In meadows: (Black Hills) S.D. — X.M. — Ariz. — Ida. 

 Submont. — -Mont. My-Jl. 



8. C. Nuttallii Torr. & Gray. A strict plant, similar to the preceding, 

 2-5 dm. high, but with a bulblet borne in the a.\il of the lowest leaf, 1-4 cm. 

 above the bulb; leaves and flowers resembling those of the preceding, but petals 

 often narrower, and sometimes acutish; capsule tapering at both ends. C. Wat- 

 soni M. E. Jones. Dr>- hillsides: (Black Hills) S.D.—N.M.— Calif.— Wash. 

 Submi)nt. — -Mont. My-Jl. 



9. C. fieruosus S. Wats. A decmnbent or ascending, more or less flexuose 

 and branched plant; leaves several, the lowest 1-2 dm. long, 2-3 mm. •n'ide, the 

 rest short, about 5 cm. long, acuminate; flowers several; petals broadlj- cuneate- 

 obovate, 2.5-3 cm. long, white with yellow base; gland orbicular. In dry places: 

 s Utah — Calif. — Ariz. L. Son. Je. 



10. C. aureus S. Wats. Low plant, 1-2 dm. high, 1-4-flowered; leaves 

 7-10 cm. long; bracts lance-linear, attenuate, scarious margined; sepals greenish 

 yellow, lanceolate, purple-blotched; petals broadly cuneate, about 3 cm. long, 

 bright yeUow, with a circular densely hairj* gland near the base, and a purpUsh 

 lunate spot above; capsule narrowly oblong. Sand-cliflfs: s Utah — Ariz. — N.M. 

 L. Son. Ap-Je. 



Family 25. TRILLIACEAE. Trillium Family. 



Perennial caulescent or scapose herbs, ■with rootstocks. Leaves and bracts 

 whorled, broad and often netted-veined. Flowers perfect, solitary, terminal, 

 or in terminal umbels. Sepals 3 (or in exotic genera 4), green, distinct; 

 petals of the same number, in ours white or purplish. Stamens 6-8; fila- 

 ments short. Gynoecium of 3 or 4 united carpels; ovary 3- or 4-celled; 

 stigmas sessile. Fruit a 3- or 4-celled, lobed berry. 



1. TRILLIUM L. Wake-robin, Birth-root. 



Fl&shy herbs, with short stout rootstocks and a whorl of 3, netted-veined, 

 leaves near the end of the scape. Flowers solitary, 3-merous, pediceUed or sessile. 

 Sepals persistent. Petals earh' withering or deciduous, white or purple. 



Flowers sessile; leaves long-petioled ; blades rounded. 1. T. petiolatum. 



Flowers peduncled: leaves subsessile, rhombic. 2. T. otatum. 



1. T. petiolatum Pursh. Rootstock corm-like; stem 1-2 dm. high; petioles 

 3-6 cm. long; leaf-bladps 7-10 cm. long and 6-10 cm. wide; sepals 3-4.5 cm. long, 

 Unear-lanceoiate ; petals dark purple, linear-oblanceolate, slightly exceeding the 

 sepals. "Rich hillsides and copses: Wash. — Ida. — Ore. Son. — Submotit. Ap- 

 My. 



2. T. ovatum Pursh. Rootstock corm-like; stem 3-4 dm. high; leaves 

 acuminate, 7-12 cm. long, 4-8 cm. wide; pedicels 4-5 cm. long, slender; sepals 

 Unear-lanceolate, 2.5-4 cm. long; petals somewhat longer, obovate to narrowly 

 lanceolate, pink or white, turning purple. T. Scouleri Rydb. T. crassifolium 

 Piper. Woods: B.C. — -Mont. — Colo. — Calif. Submont. — Mont. ]Mr-Jl. 



