BUCKWHI-AT FAMILY. 



553 



4. OXYRIA Hill, Yetf. Sy>t. io : 24. 1765. 



Low fleshy glabrous perennial herbs, with slender erect stcniv Leave* mostly haul, long- 

 stioled, renifonn or orbicular, cordate, paltnately nerved, uith cvlindric ocreme. Flower* 

 jerfect, small, green, in terminal panic-led raceme tmtqmOy 4-parted. the outer 



egments smaller than the inner; stamens h, included; filaments short, subulate. glahrom; an- 

 iers oblong. Ovary i-celled; ovule solitary; style short. 2-j 



igmas fimbriate, persistent on the large wings of the fruiting calyx. A. hem- . .vatt- . lenticular. 

 ibryo straight, lx>rne in the centre of the endosperm, [r.reek, sour, from the acid leave*.] 

 Two known species, the following, and oiu- in the 

 [inialayas. 



i. Oxyria digyna (L.) Caniptdera. 

 Mountain Sorrel. (Fig. 1315. ) 



if.v digynus L. Sp. Pi. 337. 1753. 

 O. digyna Caniptdera, Rumex, 155. />/.,-. f.j. 1819. 

 .i-yria rcnifonnis Hook. Fl. Scot. m.' 1821. 

 Rootstock large, chaffy; steins scape-like, simple 

 sparingly branched, leafless or nearly so, 2' -12' 

 ill. Leaves renifonn or orbicular-reniform, ft'- 

 *' wide, undulate, sometimes emarginate at the 

 apex, the basal long-petioled; ocreae oblique, loose, 

 those on the stem bearing flowers; racemes many- 

 flowered; flowers slender-pedicelled; segments ob- 

 long, the inner erect, the outer reflexed in fruit; 

 achene pointed, smooth, surrounded by a broad 

 icmbranous wing. 



Greenland and Labrador to Alaska, south to the 

 White Mountains of New Hampshire and in the Rocky 

 Mountains to Colorado. Also in northern Europe and 

 Asia. July-Sept. 



5. FAGOPYRUM Gaertn. Fr. & Sem. 2. 182. 1791. 

 Annual or perennial rather fleshy usually glabrous leafy herbs, with erect, simple or 

 branched, striate or grooved stems. Leaves alternate, petioled, hastate or deltoid, with ob- 

 lique, cylindric or funnelform ocreae. Flowers small, white or green, in terminal or axillary 

 usually paniculate racemes, perfect, borne solitary or M-veral together from each ocreola, 

 slender-pedicelled. Calyx about equally 5-parted, persistent and unchanged in fruit, the 

 segments petaloid, shorter than the achene. Stamens S, included; filaments filiform, gla- 

 mms; anthers oblong. Ovary i-celled, i-ovuled; styles-parted; stigmas capitate. Achene 3- 

 igled. Embryo central, curved, dividing the mealy endosperm into two parts; cotyledons 



[Greek, beech-wheat, from the similarity of the grain.] 

 About 6 species, natives of Europe and Asia. 

 Racemes panicled or corymbose; angles of the achene not crested. i. F. F>i. 



Racemes mostly simple: angles of the achene crested, undulate. 2. F. Tatar-team. 



i. Fagopyrum Fagopyrum (L/.) Karst. Buckwheat. (Fig. 1316.) 



/Wi >,'<"""" i-'affofiyriiHi I,. Sp. PI. .^64. ; 



Fagopyrum esculentum Moench. Mrt! 



F. Fa'gopymm Kat-t Ikul-<h 1 '!. -JJ. 1880-83. 



Annual, glabrous except at the 

 strongly grooved when old, i-3 high. Leaves 

 hastate, i'~3' long, abruptly narrowed above the 

 middle, acuminate, the nerves on the lower ur- 

 face slightly scurfy; m-reae brittle an : 

 racemes mostly panicled. some 1 :nboae, 



many-flowered, erect or inclined to droop 

 eels as long as the calyx; segments \\lrn, or whit- 

 ish; stamens included; style-branches deflexed 

 in fruit; achene acute, 2 V' lo "g. about twice as 

 long as the calyx, its faces pi nnatcly -striate 

 when mature, the angles acute, en 1 



In waste places, and per>i-u-m in fu-l-l- .tfu-r cul- 

 tivation. Reported from almost all parts of the 



northern United States ami southern Hriti*! 



'..itive <i ea~tern Ktirope "i w 



Jane-Sept 



