195 



* * Rays more numerous, very narrow, diurnal; achenes turgid, 



indistinctly rugose, with a beak-like apiculation at 

 summit of the inner angle. 



5. H. corymbosa (DC.), Torr. & Gray. Pubescent, viscid and gland- 

 ular, 1 ft. high, corymbosely and widely branching: radical leaves 

 pinnately divided into linear segments, the uppermost linear entire: 

 pappus of sterile disk ovaries of palese cut into chaffy bristles, or nearly 

 obsolete. Plains and hills near the Bay. July Nov. 



6. H. angustifolia, DO. Hirsute and viscid-glandular, widely branch- 

 ing from the base: leaves mostly entire, linear, less than 1 in. long: rays 

 12 15; pappus of sterile disk-achenes none, or a row of minute bristles 

 rather than scales. Less frequent than the preceding. 



* * -x- Rays 5 only, broader; disk-flowers also few; tips of involu- 



cral bracts short, rigid, erect: achenes as in the preceding 

 group, but more rugose. 



^Receptacle chaffy only next to the rays; disk-ovaries with a pappus. 



7. H. fascicnlata (DC.), Torr. & Gray. Hirsute or hispid below, gla- 

 brous and viscid-glandular above, 618 in. high: heads small subsessile, 

 usually faciculate-clustered: involucral bracts glabrous or glandular- 

 hispidulous, those of the receptacle slightly united: pappus of disk- 

 ovaries of 6 10 linear paless. Hills of the Mt. Diablo Range, near Wal- 

 nut Creek, Livermore, etc. June Aug. 



8. H. Wrightii, Gray. Slender, diffusely and widely branching; the 

 filiform branchlets terminating in a single head: lower leaves laciniate- 

 pinnatifid: disk-ovaries with pappus of 8 or 9 oblong firm paless. Native 

 of San Bernardino Co., but found on the Oakland mole in 1881; at that 

 time a species still undescribed. It has not reappeared in this district. 



9. H. Kelloggii, Greene. Hirsute below, loosely paniculate above, 1 3 

 ft. high, the heads on slender pedicels: lower leaves pinnately parted: 

 involucre % i n - high; bracts glandular on the back: ray-achenes with a 

 slender curved beak; pappus of the sterile ones of the disk long, almost 

 equalling the corolla, lacerately truncate and united into a tube from base 

 almost to summit. Abundant in fields of grain on the lower San 

 Joaquin from Antioch southward. 



-*-*Virgately racemose species; all the flowers subtended by bracts; 

 disk-achenes with no pappus. 



10. H. Heermanni, Greene. Viscid and pubescent, heavy-scented, 

 1 3 ft. high: minute leaves of the flowering branchlets scattered: bracts 

 of hemispherical involucre viscid-pubescent and beset with stalked 

 glands; terminal gland inconspicuous : disk-flowers 10 15. Mt. Diablo 

 and southeastward. Aug. Oct. 



