88 MIDDLESEX FLORA. 



P. dumetorum, L., var. scandens, Gray. Climbing False 

 Buckwheat. 

 Common. Aug.-Sept. 



FAGOPYRUM, Tourn. 



F. ESCULENTUM, Moench. BUCKWHEAT. 



Common. June-Aug. Nat. from Eu. 

 F. Tataricum, Gaertn. INDIA WHEAT. 



Soraerville (C. E. Perkins) ; Cambridge (fide specimen in herb. 



B. S. N. H.) July-Aug. Adv. from Asia. For description, see 



Wood's Bot. & Fl. 



RUMEX, L. 



R. PATIENTIA, L. PATIENCE DOCK. 



Weston and Wakefield (F. S. Collins). July-Aug. Nat. from Eu. 



R. Brittanica, L. (R. orbiculatus, Gray, Man.) GREAT WATER- 

 DOCK. 



Somerville, Maiden, Concord, Lowell, et al. Not uncommon. 

 Aug.-Sept. 



R. verticillatus, L. SWAMP DOCK. 



Tewksbury (B. D. Greene, specimen in herb. B. S. N. H.) ; Somer- 

 ville and Belmont (C. E. Perkins) ; Waltham List. June-July. 



R. CRISPUS, L. CURLED DOCK. YELLOW DOCK. 

 Very common. June-July. Nat. from Eu. 



R. OBTUSIFOLIUS, L. BITTER DOCK. 



Common. June-Aug. Nat. from Eu. 



R. CRISPUS, L. X OBTUSIFOLIUS, L. 



Maiden (F. S. Collins) ; Medf ord (L. L. Dame) . June-Aug. 

 R. ACETOSELLA, L. SORREL. 



Very common. May-June. Nat. from Eu. 



CHORIZANTHE, R. Br. 



** Involucre 1-3 flowered, sessile, tubular, coriaceous or chartaceous, 

 more or less reticulated or corrugated, 3-6 angled or costate and 

 3-6 toothed or cleft, the teeth cuspidate or rigidly awned. Flowers 

 pedicellate or nearly sessile, included in the involucre or rarely 

 exserted, 6 parted Or cleft. Stamens 9, rarely 3 or 6. Bractlets 

 minute or usually obsolete. Ovary glabrous and akene triangular. 

 Low, dichotomously branched annuals, with usually rosulate, radical 

 leaves, and ternate bracts." Bot. Cal. 



<7. pungens, Benth. 



N. Chelmsford, wool-waste (Rev. W. P. Alcott; specimen in herb, 

 of). Adv. from Cal. 



" Usually slender and more or .less decumbent or at first erect, 

 villous-pubescent ; stems often a foot long or more, leafy ; leaves 



