BUCKWHEAT FAMILY 11 



18. Chorizanthe diffusa Benth. 

 Diffuse Chorizanthe or Spine-flower. Fig. 1322. 



Chorizanthe diffusa Benth. PI. Hartw. 333. 1857. 



Chorizanthe pungens var. diffusa Parry, Proc. Davenp. Acad. 4: 60. 1884. 

 Chorizanthe pungens var. nivea Curran, Bull. Calif. Acad. 1 : 294. 1885. 

 Chorizanthe Andersonii Parry, Proc. Davenp. Acad. 5: 175. 1889. 

 Chorizanthe nivea Jepson, Man. Fl. PI. Calif. 297. 1923. 



Stems ascending or decumbent, one to several from the base, 6-25 cm. long, rather thinly 

 villous-pubescent. Leaves basal, 2-4 cm. long, oblanceolate, petioled, villous-tomentose beneath, 

 thinly so above ; bracts opposite, those of the lower nodes f oliaceous but spine-tipped, the upper 

 reduced and acicular; involucres in small cymose clusters, mainly terminal, the tube 3-angled, 

 about 2 mm. long, villous-hirsute, 6-toothed, 3 outer teeth larger, all divergent, uncinate-tipped, 

 and with a conspicuous white membranous margin parted at the sinuses; calyx partly exserted, 

 2.5 mm. long, the lobes oblong, acutish, entire; stamens 9. 



Sandy and gravelly soils, mainly Upper Sonoran Zone; San Mateo County to Santa Barbara County, Cali- 

 fornia. Type locality: dry sandy places, Monterey, California. April-June. 



19. Chorizanthe stellulata Benth. 

 Starlet Chorizanthe or Spine-flower. Fig. 1323. 



Chorizanthe stellulata Benth. PI. Hartw. 333. 1857. 



Stems erect, simple up to the umbellate-branched inflorescence, hirsute-tomentose. Leaves 

 basal, linear-oblanceolate, slightly narrowed below to the winged petiole, 1-2 cm. long, sparsely 

 hispid-hirsute ; cauline bracts opposite or verticillate, foliaceous and similar to the basal leaves ; 

 floral bracts acicular, hispid ; cymes head-like and solitary or several in a terminal compound umbel ; 

 involucres cylindric-urceolate, 4 mm. long, 6-ribbed, transversely wrinkled between the ribs, the 

 teeth nearly equal, horizontally spreading, the membranous margin broad, white or purplish, 

 partly cleft but continuous through the sinuses, the apex slender, more or less uncinate; calyx 

 pale yellow, 4-4.5 mm. long, the outer lobes broadly obovate, more or less bilobed; stamens 9. 



Dry soils, Upper Sonoran Zone; foothills of Sierra Nevada and North Coast Ranges, Shasta County to Lake 

 and Tulare Counties, California. Type locality: "Valley of the Sacramento," Hartweg. May-June. 



20. Chorizanthe robusta Parry. 

 Robust Chorizanthe or Spine-flower. Fig. 1324. 



Chorizanthe robusta Parry, Proc. Davenp. Acad. 5: 176. 1889. 

 Chorizanthe pungens var. robusta Jepson, Fl. Calif. 1 : 392. 1914. 



Plants erect or ascending, 1-5 dm. high, simple below or branched from the base, the branches 

 spreading, villous-hirsute. Leaves basal or sub-basal, 3-8 cm. long, oblanceolate, long-petioled, 

 hirsute-villous, bracts opposite or verticillate, the lower similar to the leaves, the upper apiculate 

 and the uppermost acicular; involucres in large dense cymose clusters, the tube cylindric, 3.5-4 

 mm. long, 6-toothed, the teeth somewhat divergent, the 3 outer ones slightly larger, straight or 

 more or less uncinate, membranous-margined ; calyx included or slightly exserted, 3-4 mm. long, 

 the lobes oblong-elliptic, rounded and erose at apex; stamens 9. 



Mostly in sandy soils, Upper Sonoran Zone; San Francisco Bay region to Monterey and Salinas Valley, 

 California. Type locality: dry sandy soil, margins of Monterey Bay north of Aptos, Santa Cruz County, Cali- 

 fornia. May-Sept. 



21. Chorizanthe valida S. Wats. 

 Sonoma Chorizanthe or Spine-flower. Fig. 1325. 



Chorizanthe valida S. Wats. Proc. Amer. Acad. 12: 271. 1877. 



Plants erect, simple below, mostly few-branched above, 6-30 cm. high, rather thinly villous. 

 Leaves basal or sub-basal, broadly oblanceolate or spatulate, 3-6 cm. long, long-petioled, villous 

 beneath, sparsely so above ; bracts foliaceous, similar to the basal leaves, the uppermost reduced 

 and spinose-tipped ; involucres in large dense head-like leafy-bracted cymes ; tube 4 mm. long, 

 finely transversely corrugated, glabrate except for ascending hairs on the ribs, 6-toothed, the teeth 

 erect or only slightly divergent, the spines straight not uncinate, stramineous; calyx 5-6 mm. 

 long, outer lobes oblong, truncate, conspicuously erose, the inner narrower ; stamens 9. 



Sandy soils, Humid Transition Zone; along the coast of Sonoma County to Point Reyes, Marin County, 

 California. Type locality: "Russian Colony," Sonoma County, California. June- Aug. 



22. Chorizanthe Howellii Goodman. 

 Howell's Chorizanthe or Spine-flower. Fig. 1326. 



Chorizanthe Howellii Goodman, Ann. Mo. Bot. Gard. 21: 44. pi. 3. f. 1. 1934. 



Branching from the base, the branches prostrate or decumbent, 1-2 dm. long, villous with 

 ascending hairs. Leaves basal, spatulate to broadly obovate, 3-5 cm. long, villous-hirsute beneath, 

 sparsely so above; bracts similar to the leaves, opposite; involucres in dense clusters, 5-6 mm. 

 long, the tube subcylindric, the teeth spreading, the 3 alternate a little shorter, tipped with straight 

 spines, the membranous margin parted at the sinuses; calyx 4 mm. long, slightly exserted, the 

 lobes oblong, truncate and denticulate at apex; stamens 9. 



Sand dunes, Humid Transition Zone; coast of Mendocino County, California. Type locality: sand dunes 

 on Mendocino coastal plain, Fort Bragg, California. June-Aug. 



