MIDDLESEX FLORA. 



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

 Buckwheat. 

 Common. Aug.-Sept. 



Pagopyeum, Tourn. 



F. ESCtTLBNTUM, Moench. Btjckwheat. 



Common. June-Aug. Nat. from Eu. 

 F. Tataricum, Gaertn. India Wheat. 



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



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



Wood's Bot. & Fl. 



EUMEX, L. 



E. Patientia, L. Patience Dock. 



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



R. Brittanica, L. (E. 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. 



E. CRispus, L. Curled Dock. Yellow Dock. 

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



E. OBTusiFOLius, L. Bitter Dock. 

 Common. June-Aug. Nat. from Eu. 



E. CRISPUS, L. X OBTUSIFOLIUS, L. 



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

 E. Acetosella, L. Sorrel. 

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



Chorizanthe, E. 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 r-arely 

 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. 



■C. pungens, Benth. 

 N. Chelmsford, wool-waste (Eev. 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 



