12 University of California Publications. [BOTANY 



5. Collomia heterophylla Hook. Oilia heretophylla Gray. 



Annual, three to fifteen inches high, branching, puberulent, 

 and somewhat glandular; leaves variously divided and cleft in 

 the same plant, most deeply divided at the base; inflorescence of 

 small, bracted, terminal clusters; bracts broad and exceeding 

 the flowers, entire or notched; calyx with only slightly re volute 

 sinuses in the flowering stage but more re volute in fruit, the very 

 slender acerose lobes exceeding the tube in length ; corolla four 

 to six lines long, funnelform, tube dark purple, slender, lobes 

 lighter in color, one and one-half lines long; stamens of unequal 

 lengths, inserted unequally in the tube, anthers round, yellow; 

 pistil about half the length of the corolla; capsule oblong, 

 equalling the tube of the calyx, seeds two or three in each cell. 



Lower slopes of Mt. Tamalpais, Marin Co., W. L. Jepson, 

 H. P. Chandler. Ho well Mt., Napa County, J. P. Tracy. 

 Mendocino Co., W. L. Jepson. Eureka, Humboldt Co., J. P. 

 Tracy. Jackson, Amador Co., Geo. Hansen. 



NAVARRETIA Ruiz & PAVON. 



Leaves all alternate, pinnatifid, segments setaceous or spin- 

 escent; calyx tube scarious between the prominent angles, not 

 splitting in fruit, segments more or less unequal; stamens 

 equally or subequally inserted. There is much more similarity in 

 the habit of the species of this genus than in any of the others. 



KEY TO THE SPECIES. 



A. All the leaves lax, bracts more or less so. 



a. Prostrate, with radiating branches from beneath the sessile pri- 



mary inflorescence, which is near the ground. 1. N. prostrata. 



b. A span high; leaves and bracts long and usually twice pinnatifid; 



primary flower cluster sessile. 2. N. leucocephala. 



c. Three inches high or less; leaves few, linear, entire or with few 



segments, bracts more or less rigid. 3. N. minima. 



d. Four to fourteen inches high ; stems leafy to the top ; flowers 



white, small. 4. N. cotulaefolia. 



e. Equally tall; flowers larger and yellow. 5. N. nigellaeformis. 



f. Two to six inches high; inflorescence woolly; bracts rigid and 



pungent; flowers with yellow tube and purple limb. 



6. JV. prolifera. 



B. Leaves as well as bracts rigid and pungent. 



a. Leaves sometimes lax at the base, rigid above with acerose pin- 

 nae; long retrose white hairs on the stem. 7. N. intertexta. 



