BUCKWHEAT FAMILY 



401 



6. 0. dendroidea Xutt. Stem erect, tri- and di-ehotomously hranchiiig 

 above the base, 7 to 14 inches higli, hispidulose-glandular, the involucres 

 nearly sessile or shortly pedicelled along the branchlets, or those in the forks 

 mostly on pedicels 1 to 4 lines long; leaves linear to oblanceolate, revolute, 

 acute, thinly hirsute, % to II/2 inches long; involucres narrowly turbinate, y^ 

 to 2 lines long, 4-lobed, the lobes with very unequal awns or sometimes the 

 awns obsolete ; flowers about 3 ; calyx pale rose or whitish, rough pubescent, 

 very shortly lobed. 



Lassen Co., not otherwise known in California. North to Washington and 

 easterly through northwestern Nevada to Wyoming. 



Lncs. — Hniiey Lake, Braiuieget ; Reno, Nev., Jepson in lS91i. 



R»'f. — OxYTHECA DENDROiDE.\ Nutt. Jour. Acad. Phila. ser. 2, 1: KM) (1848), type loc. 

 Snake River sandhills. Rocky Mts., Nuttall. 



7. 0. watsonii T. & G. Stem erect, dichotomously branching above the base, 

 6 to 9 inclies high, glaucous; leaves spatulate, % to 1 inch long; bracts awned, 

 retlexed; involucres turbinate, 4-lol)ed, with elongated awns, li^ lines long, 

 ))oriie on pedicels 2 to 5 lines long; flowers V2 line long, white, puberulent. 



( 'ushcnberry Sprs., Mohave Desert, »S'. B. tf- W. F. Parish 1241. Nevada. 

 The awned bracts are reflexed in Nevadan plants, but apparently not so in the 

 Parish specimens. 



Refs. — OXYTHECA WATSONH T. & G. Proc. Am. Acad. 8: 191 (1870), type loc. Monitor 

 Valley, Nev., Watson; Wats. Bot. King, 311, pi. 33, figs. 5-7 (1871). 



8. 0. parishii Parry. (Fig. 71.) 

 Stem erect, diffusely but sparingly 

 tri- and di-chotomous above the base, 

 8 to 14 inches high, glabrous and 

 glaucous except a hispidulose-glan- 

 dular band on the lower part of the 

 internodes and on the pedicels ; 

 leaves basal, spatulate-obovate, Vo to 

 IV4 inches long ; bracts small, 3-cleft ; 

 involucres on axillary and terminal 

 pedicels (Vt to 11/4 inches long), the 

 tube turbinate, short (1 line long), 

 but developing from its margin a 

 circle of 14 to 21 excurrent bristles 2 to 3 lines long; flowers 5 to 14, pedicelled; 

 calyx 6-cleft nearly to base, its lobes linear-oblong, almost distinct, pubescent 

 on back; stamens 9. 



San Gabriel and San Bernardino mountains, and north to Mt. Pinos, 4500 to 

 6500 feet. 



Locs. — Mt. Wilson, Davidson, Stokes; Swartout Canon, Mt. San Antonio, Sail 1250. 

 Refs. — OxY'THECA PARISHO Parry, Proe. Davenp. Acad. 3: 17(5 (1882), type loc. San Ber- 

 nardino Mts., Parish Bros. 993. This species has been made the type of the monotypic genus 

 Acantlioscyphus, Small, Bull. Torr. Club, 25: 53 (1898), a genus resting essentially on the 

 numerous invohicral awns. While this is a striking character, it may be pointed out that the 

 awns are sometimes few and that Oxytheca trilobata sometimes displays multiple teeth or 

 awns. 0. abramsii McGregor, Bull. Torr. Club, 36: 605 (1909), type loc. Topatopa Mts., 

 Ventura Co., Abrams cf- McOrcffor 72, is a form with fewer (7 to 12) awns. Hall's 6452, 

 Mt. Pinos. is the same. 



11. ERIOGONUM Michx. 



Annual or perennial herbs or small shrubs with basal or alternate or whorled 

 leaves without stipules, those of the inflorescence commonly reduced to bracts. 

 Flowers perfect, l)orne in an involucre, more or less exserted on their stalklets 

 and commonly reflexed or recurved in age, intermixed with narrow scarious 

 bractlets. Involucres 4 to 8-toothed or -lobed, several to many-flowered, borne 



Fig. 71. OxTTHECA PAKISHII Parry; 

 involucre, x 5. 



