VOL. 2] MilliJffn. Calif ornian Ptflemonfaceac. 4"> 



KEY TO THE SPECIES. 



A. Dichotomously branched without scabrous pubescence; flowers sessile 



or subsessile. 



a. Not glandular; corolla limb one inch broad. 1. L. diehotomus. 



b. Not glandular; corolla much smaller. 2^ J^Jtigelovii . 



c. Glandular pubescence on calyx. 3. L. Jonesii. 



d. Soft -pubescent throughout; flowers large with very short tube, 



and toothed or fringed margins. 4. L. dianthiflorux . 



B. Less dichotomous; leaves scabrous-pubescent; flowers on capillary 



or filiform pedicels. 



a. Corolla five to six lines long, broad-funnelform to rotate, white, 



often with blue lines; pilose ring at the base of the filaments. 



5. L. linifloruti. 



b. Corolla three lines long, campanulate, exceeding the calyx by 



two lines. 6. L. filipes. 



c. Corolla smaller; calyx extremely narrow with acute base. 



7. L. pusillus. 



d. Corolla minute, not exceeding one and one-half lines, broader 



than the last; capsule one-seeded. 8. L. Harknessii. 



c. Corolla tube equalling or slightly exceeding the calyx, limb sal- 



verform. 9. L. Bolanderi. 



f. Corolla one -half inch long, tube equal to the calyx or slightly 



exserted, expanding into an ample, dark purple throat. 



10. L. ambiguus. 



g. Corolla one-half inch long, tube much exserted. 11. L. Rattani. 



C. Not dichotomously branched ; flowers not on capillary pedicels nor in 



heads. 



a. Coi'olla one-half to three-fourths inch long, tube very short with 



a conspicuous appendage at the base of each lobe. 



12. L. Parryae. 



b. Corolla smaller, no appendages. 13. L. demissus. 



c. Corolla tube six to seven lines long. 14. L. Pacificus. 



d. Corolla twice the calyx, tube one-half line long, no appendages. 



15. L. concinnus. 



e. Corolla golden yellow. 16. L. aureus. 



D. Perennials. 



a. Flowers in small heads, sessile or subsessile; leaves with broad 



linear segments. 17. L. Nuttallii. 



b. Flowers less crowded, pediceled; leaves with narrower segments. 



18. L. Jloribundufi. 



E. Flowers in bracteate heads, sessile, with corolla tube exceeding the 



the calyx except in L. Lemmoni, L. maculatus and forms of 

 L. densiflorus; herbage ciliate-pubescent. 



a. Flowers in small heads; corolla two and one-half lines long, 



leaves entire. 19. L. maculatus. 



b. Flowers in numerous small heads: corolla twice the calyx or less, 



pale yellow with darker throat. 20. L. Lemmoni. 



