IM APPEiSTDlX. 



Si. polygonum. Gm. PI. 677. 

 tGr. Poly, much, and GonUi a knee, or joint; the stem being much jointed.] 



Cal. 0. Cor. 5 or 4 parted, persiste.it. Seed 1, mostly 3 angled, covered. Stain, and Styles variable. 



1*. fagoPyrum Willd. Stem erect, unarmed; leaves cordate -sagittate; angles of the seeds equal. 



Fii/g-o— Commoii Buck-Wheat. 



fl- Middle of August, and after. fr- mat. Beginning of October, 



Hab Fields. Annual. 2 to 4 feet high: flowers white, with tinges of red. Nat. Asia. 



Obs. The grain of this plant affords a very favorite article of food, under the name of Buckwheat Calfs, 

 -— and it is extensively cultivated in some neighborhoods: But our best farmers, who possess first rate land, 

 are not fond of sowing it. It is considered a severe crop upon the soil, an<i not very profitable. It is most 

 cultivated in ro'igb, hillj' districts; and is generally employed to subdue Wild lands,— for which it is admira- 

 bly adijpled. The flowers have 8 small, shining, nectariferous glands, at the base of the filaments,— on the 

 product of which the honey-bees delight to revel. The seed is usually sown about the middle of July. 



CLASS IX. ENNEANDRTA. 



ORDERj THIGYNIA. 



32. RHEUM. Gen. PI. 692. 



[Qr. rheo, to fiow; from its medicinal properties: or from the river Rha, its plate of growth. JDe Theis-'} 



Cal. 0. Cor. 6 cleft, persistent. Seed 1, triquetrous. 



R. RHAPoNTicuM. TVUld. Leavcs cordate, obtuse, glabrous; petioles sulcate above, margins rounded. 



Fu/g:o— Rhubarb. Pie Rhubarb. 



Fl. Latter end of May. Fr. mat. Middle of July. 



J7a&. Gardens. Perennial. 3 to 4 feet high: f!ov(rers white. iVaf. Thrace, Scythia, &c. 



Ohs. Is not Mr. Eaton in error, with respect to this plant, in calling it R. tartarinim? See Smith, in 

 Jlees' Cyclopaedia, on both species. This is cultivated by some, rather as a curiosity, than for purposes of 

 litility ; but its succulent, acid petioles, are sometimes used for making tarts, — which are quite palatable. 



CLASS X. DECANDRIA. 



33. RUTA. Gen. PI. 725. 

 [A name of obscure and uncertain derivation.] 



VjXIi. 5 or 4 parted. Cor. petals 5, or 4, concave. Recept. surrounded by 10 nectariferous dots. Ca?s. lobatc 



it. iRAVEOLENs. WiUd. Leaves supradecompound; leaflets oblong, terminal ones obovate. 



FM/go— Rue. Garden Rue. 



Fl. Latter end of June, and after. Fr. mat. 



Hab. Gardens. Perennial. 2 to 3 feet high: flowers yellow. Nat. Southern Europe. 



Obs. This is occasionally to be met with in our gardens on account of its bitter, medicinal qualities; birJ 

 i". is not much attended to. 



CLASS XL POLYANDRIA. 



3-1. CITRUS. Gen. PL 1218. 

 [A name of unknown derivation.] 



llAiiSekfi fJo"R. pets-Is 5. FJ/. dilated, connate in parcels. Beery PJcelled, coat carnoee 



