46 University of California Publications. [BOTANY 



c. Flowers in heads; corolla funnelform, with purple to white 

 limb, equalling or exceeding the tube. 21. L. densiflorus . 



d. Flowers in large heads with broad bracts ; corolla tube averaging 



one inch, throat funnelform, brown or yellow, lobes broad, 

 purple. 22. L. androsaceus. 



e. Flowers white, tube little exceeding the calyx. 23. Mariposianus . 



f. Flowers in rather small heads; corolla tube extremely narrow 



and long-exserted, throat short. 24. L. parviflorus. 



g. Flowers few in an almost ebracteate cluster; plant gray with close 



pubescence. 25. L. Graciosus. 



h. Flower heads small; foliage not at all ciliate but closely spinose- 



toothed. 26. L. serrulatus. 



i. Flower with golden-yellow corolla, lobes only one and one-half 



lines long; leaf segments linear-acerose; plant not exceeding 



four inches. 27. L. acicularis. 



j. Corolla tube comparatively broad, lobes barely exceeding one 



line, limb yellow and reddish-purple ; plant one to three inches 



high. 28. L. bicolor. 



k. Corolla little exceeding the bracts, or much exserted, lobes one 



line long or less ; bracts long-ciliate-margined. 29. L. ciliatus. 

 I. Corolla large, tube much exserted, lobes obovate or truncate, 



three to four lines long. 30. L. montanus. 



m. "Corolla well exserted, lobes rose-red with semilunar vermilion 



spots near the base " (Greene). 31. L. neglectus. 



1. Linanthus dichotomus Benth. Oilia dichotoma Benth. 



Slender large-flowered annual, four to twelve inches high, 

 simple or dichotomously branched, branches at first diverging 

 from the main stem, then becoming erect, the whole plant glabrous 

 except a slight scabrous pubescence on the upper leaves and seg- 

 ments of the calyx, and glandular white pubescence on the inner 

 side of the calyx segments at the sinuses; leaves from one-half to 

 two inches long, averaging one inch, sometimes entire and filiform, 

 usually palmately three- parted, divisions filiform and setaceous- 

 tipped; flowers solitary in the axils or terminal; calyx about 

 one-half inch long with the tube slender and straight or some- 

 times expanded near the base, thus urn-shaped, scarious except 

 the five ribs, prolonged into linear setaceous segments, more or 

 less recurved; corolla white or purple, with cylindrical tube, 

 slightly exserted in age, abruptly expanding into the short throat, 

 limb about an inch broad, lobes ovate or roughly triangular with a 

 slightly wavy margin; stamens nearly equalling the tube, inserted 

 about one- third from the base of the tube, with pubescent 



