158 POLYGONE^. 



fring'ed margins below : stamens inserted near the base ; anthers oval- — 

 In Santa Barbara Co., and southward beyond our limits. June. 

 * * Involucres broadly triguetrons, 3 -9-(uolhed or lobed; teelh veri/ 

 unequal; lube transversely corrugated; stamens on the throat 

 of the perianth.— Qenns Acanthogonum, Torr, 



18. C. polygonoides, T. & G-. Proc. Am. Acad. viii. 197 (1870). Diffuse, 

 prostrate, 4—10 in. broad, glabrous or sparingly pubescent, the branches 

 very fragile at the Joints : radical leaves narrowly spatulate, obtuse, 

 narrowed to a slender petiole which is dilated at base ; bracts scarcely 

 foliaceous, acute : involucres rather crowded on the short branches, 

 broadly triangular-turbinate, 3-costate, with 3 stout and broad ixncinate 

 teeth longer than the tube, the intermediate ones verj- small : perianth 

 nearly sessile ; segments oblong, equal : stamens 6 or 9 ; filaments very 

 short ; anthers round-oval : achene broadly triquetrous, rostrate.— Foot- 

 hills of the Sierra near Placerville, Rattan, and about Ohico, Parry, Mrs. 

 Austin. 



* * * Glabrous or glandular, never villous-tomentose ; nodes subtended by 



large bracts (except in n. 21); involucres coriaceo-chartaceous, 



tlie aivtis not uncinate; perianth bearing stamens at 



base. — G-enus Mucronea, Benth. 



19. C. Californica, Gray, Proc. Am. Acad. viii. 197 (1870) ; Benth. 

 Trans. Linn. Soc. xvii. 416. t. 20 (1837), under Mucronea. Sparingly 

 hirsute and glandular, 1 ft. high or less, whole plant red or purplish : 

 bracts amplexicaul or rarely perfoliate, deeply 3-lobed, the lobes cuspi- 

 date : involucres solitary on the ultimate branchlets but at the lower nodes 

 somewhat clustered, rather obtusely 2 3-angled and not sulcate : seg- 

 ments of perianth obovate, entire,— In the Coast Range from San Luis 

 Obispo southward. 



20. C. perfoliata, Gray, 1. c. Habit of the preceding, though branched 

 from the base, the branches decumbent : bracts connate about the stem, 

 forming a somewhat unilateral triangular disk, the lower 1 in. broad : 

 involucres scattered on the slender branchlets, 1 J^~3 lines long, strongly 

 angled and sulcate, becoming corrugated, mostly 4-toothed : perianth- 

 segments equal, oblong, laciniately fring-ed. — Ih-y foothills of the Sierra, 

 from Stanislaus Co. southward. 



21. C. iiisigiiis, Curran, Bull. Calif. Acad. i. 275 (1885). Very slender, 

 2 — 4 in. high, glandular-puberuleut : involucres turbinate, several- 

 flowered, almost hyaline between the 5 angles, the awns straight, equal : 

 perianths pedicellate, exserted, villous, pale rose-color ; segments oval 

 or oblong ; achenes lenticular. — Indian Valley, near the Salinas River, 

 Mrs. Curran. 



