TRILLIUM 



TRILLIUM 



3381 



early spring plants, and they should be more common 

 in gardens. They can be made to thrive well in borders 

 about city yards. They may also be colonized in grass 

 where the lawn-mower is not used. Best results are 

 usually attained, however, when they are planted alone 



in masses. 



album. 10. 

 angustipetalum, 4. 



INDEX. 



atropurpureum, 10. 

 calilornicum, 4. 



Caitsbsri, 14. 

 cernuum, 13. 

 discolor, 4. 

 erectum, 10. 

 erythrocarpum, 3. 

 faeiidum, 10. 

 giganteum, 4. 

 grandiflorum, 8. 

 lanceolatum, 5. 

 nTTOuin, 14. 

 nivale, 2. 

 Nuttallii, 4. 

 ovatum, 9. 

 pendulum, 10. 

 petiolatum, 7. 

 pictum, 3. 

 purpureum, 10. 

 pusillum, Iff, 

 recurvatum, 5, 6. 

 rivale, L 

 roseum, & 

 rubrum, 4. 

 sessile, 4. 

 stylosum, 14. 

 undulatum, 3. 

 Yaseyi, 11. 

 riridtscens, 4. 

 viridiflorum, 10, 

 Wrayi, 4. 



KEY TO THE SPECIES. 



A. Ovary 3-ldbed, not winged. 



B. Peduncle longer than the hs 1. rivale 



BB. Peduncle shorter than the IDS. 



c. LTS. oblong, acute 2. nivale 



cc. LTS. orate, acuminate 3. undulatum 



AA. Orary 6-angled, often winged. 

 B. Fls. sessile. 

 c. LTS. sessile. 



D. Blades broadly ovate or rhom- 



boidal 4. sessile 



DD. Blades lanceolate 5. lanceolatum 



cc. LTS. petioled. 



D. Petioles short: petals oblong-lan- 

 ceolate 6. recurvatum 



DD. Petioles as long as the blade or 



longer: petals oblanceolate. ... 7 petiolatum 

 BB. Fig. pedicelled. 



c. Pedicd longer than the fl.: hs. 



nearly or quite sessile. 

 D. Sepals much shorter than the 



petals S. grandiflorum 



DD. Sepals nearly or quite as long as 



the petals. 

 E. Petals narrowly lanceolate or 



narrowly orate (fls. white).. 9. ovatum 

 EE. Petals orate or broadly orate 



(usually purplish). 

 F. Filaments stout, much 



shorter than the anthers. . 10. e ectum 

 FF. Filaments slender, as long 

 as the anthers or nearly 



so 11. Vaseyi 



cc. Pedicel generally not exceeding and 

 usually much shorter than the fl. 



D. fl. erect 12. pusillum 



DD. Fl. declinate under the hs. 



E. LTS. rhombic or orbicular- 

 rhombic 13. cernuum 



EE. LTS. mate-lanceolate 14. stylosum 



1. rivale, Wats. Sts. slender, 2-8 in. high: Ivs. lanceo- 

 late, rounded or subcordate at base, acute or acuminate, 

 1-2 in. long; petioles 1-15 lines long: fls. white, on a 

 slender rather erect or at length declinate pedicel, which 

 is a little shorter than the Ivs; petals rather rhombic, 

 acute or acuminate, J^-l in. long, more or less marked 

 with purple. Stream-banks, mountains of Ore. and 

 Calif. G.C. III. 54:43. Allied to T. nivale, which it 

 closely resembles in habit. 



2. nivale, Ridd. A dwarf species, 5 in. or less high, 

 early: Ivs. narrow and obtuse, 1-2 in. long: fls. white, 

 on a short erect or declined pedicel, the petals about 

 1 in. long, narrow and nearly or quite obtuse. Low 

 woods, Pa. and Ky. to Minn, and Iowa. B.M. 6449. 



3. undulatum, Willd. (T. erytkrocdrpum, Michx. T. 

 pictum, Pursh). Of medium to large size, 1 ft. or more 

 high: Ivs. large, ovate and acute or acuminate, short- 

 stalked: fls. rather large, white, on a short but slender 

 erect or inclined pedicel, the petals oblanceolate and 

 wavy, about 1 in. long and usually purplish at the base. 

 Woods, Nova Scotia to Mo. and Ga. B.M. 3002. L. 

 B.C. 13:1232. 



4. sessile, Linn. Strong-growing, 1 ft. or less high: 

 Ivs. broadly ovate or rhomboidal, acute, more or less 

 spotted: fls. sessile in the whorl of Ivs., small, purple or 

 greenish, the petals narrow and acute. Woods, Pa. to 

 Minn., Ark., and Fla. B.M. 40. L.B.C. 9:875. F.S. 

 22:2311. Variable. Var. giganteum, H. & A. (var. 

 angustipetalum, Torr.). Similar to var. calijornicum, but 

 the Ivs. somewhat petiolate and the petals narrower. 

 Calif . and Ore. Apparently not in the trade. The forms 

 of T. sessile appear to be the only trilliums native to 

 Calif, except T. ovatum. Var. californicum, Wats. (var. 

 giganleum, Torr.). Fig. 3845. Much stouter, the Ivs. often 

 6 in. long and spotted, and the petals sometimes 4 in. 

 long: fls. purple, rose-color, or white, the petals rhombic- 

 ovate or narrower. Calif . and Ore. G.F. 3: 321 (adapted 

 in Fig. 3845). Var. Nuttallii, Wats. (T. viridescens, 

 Nutt.). Lvs. pubescent beneath, as also the upper part 

 of the st. : petals linear-lanceolate, purplish green with 

 brown base. Ark. Var. rubrum, Hort. A form of var. 

 californicum, with fls. deep red-purple. Var. Wrayi, 

 Wats. (T. discolor, Wray). Petals spatulate-obtuse, 1 

 in. long, greenish. Ga. B.M. 3097. 



5. lanceolatum, Boykin (T. recurvatum var. lanceo- 

 latum, Wats.). Plant often more than 1 ft. tall: Ivs. 

 lanceolate, sessile: fls. dull or brown-purple, an inch or 



3846. Trillium grandiflorum. 



