POLYGOXAC&C. (BUCKWHEAT FAMILY.) 375 



with \mt-Aaptd or arn**Aaped pttioled 



* Stems ftaccti, vat tri*^,b*somac*atdimbiag or supported am other pin** by 

 the rejitxedpnddesKkich beset the m^ of the tto dtriaonoftht 

 (pole rm^cdortd ornate) calyx mot Ixded: bracts chaff-Ute. 



16. P. arifolium, L. (HAI.RKRD-LEATEP TEAR-THUMB.) Stem ground- 

 angled; leave* halberd-shaped, taper-pointed, lomg-petiokd ; flowers somewhat ra- 

 cemed (few); peduncles glandular-bristly ; calyx often 4-paxted; stamats 6, 

 styles 2, very short; fruit lenticular (large). Low grounds. Aug. 



" P. sagittatun, L. (AKKOW-LEAYED TEAS-THUMB.) Stem 4- 

 f; fanes arn*r-shaped,*hort-petx>ltd; flowers capitate; peduncles smooth; 

 mostly 8; styles 3, slender; fruit sharply 3-angled. Low grounds; com- 

 July- Sept. Slender, smooth except the angles of the stem and midrib 

 these are armed with a line of fine and very sharp saw-toothed prickles. 

 which cm the hand drawn against Alls. 



* * Stems tmm'ng, mat pricUy: calyx (greenish tutged with, tdute or rose-color, with 

 Ae 3 after tSrisiaa laded, at lent njrnf.flmeen m bate funded racemes: 

 irads fife ffe **>&*. 



18. P. COXTOLVULUS, L. (BLACK BISDWEZD.) Stems twining or pro- 

 cumbent (l-2 long), nnglusk, the joints malxd; leares halberd-heart-shaped, 

 pointed ; flowers m smaU interrupted corymbose racemes ; outer colyx-loba Ixded ; 

 firut smoothish. CultiTated and waste grounds ; common. July, Aug. (Nat 



19. P. Oil ill ode, IGeh*. mfomtfy doumy ; the sheaths Jnmged it die base 

 with refiexed bristles; leaves heart-shaped and slightly halberd-shaped, taper- 

 pointed; racemes panided; calyx-lobes obscurely laded; fruit very smooth and 

 shining. Copses and rocky hills; New England and Penn. to Wisconsin, and 

 northward. July-Sept. Stems climbing 3 -9 high. 



20. P. dumetorum, L. (CLJMBIKG FALSE BUCKWHEAT.) Smooth; 

 sheaths noted; leaves heart-shaped or slightly halberd-shaped, pointed; racemes 

 interrupted, leafy; the 3 outer calyx-lobes sbmafy ieded and in frmt winged, the 

 wings eflm broad, somelnMi^tj narrow ; fruit smooth and shining. (P. scan- 

 dens, />.) Moist duckets; common. Aug. Stems twining 8-12 high 

 over boshes. (En.) 



2. FAGOPYRUH, Tonrn. BUCKWHEAT. 



Calyx petal-like, equally 5-parted, withering and nearly unchanged m fruit. 

 Stamens 8. Styles 3 * stigmas capitate. Acfaennun 3-sided, longer than die 

 calyx. Embryo large, in die centre of die albumen which it divides into 2 parts, 

 with very broad and foliaceous plaited and twisted cotyledons. Annuals, with 

 triangular-heart-shaped or halberd-shaped leaves, semfcylindrical sheaths, and 

 corymbose racemes or panicles of white flowers, often tinged with green or rose* 

 color. (Name $77*' <* oeech, and rjpot, r*rf, from die shape of die gran 

 being that of the beech-nut; whence also die English name nc*wheat. from 

 Ae Gennan Bucte. fcfdL) 



