38 MIDDLESEX FLORA. 



CE. biennis, L. var., cruciata, Torr. & Gray. 



Chelmsford (Dr. C. W. Swan) ; Woburn (Mrs. P. D. Richards). 

 (E. biennis, L., var. grandiflora, Lindl. 



Maiden, escaped (F. S. Collins). 

 CE. pumila, L. 



Common. June-July. 

 CE. bistorta, Kutt. 



Wool-waste, N. Chelmsford, abundant (Rev. W. P. Alcott) . Adv. 



from Cal. 



"Somewhat hirsute, the leaves sometimes appressed pubescent; 



stems rather stout, decumbent or ascending, a foot or two high ; 



leaves thinner, narrowly lanceolate to ovate, the upper mostly 



sessile and rounded or cordate at base, all denticulate or dentate ; 



petals 4 to 7 lines long, usually with a dark brown spot at base ; 



capsule 4 to 9 lines long, a line or more wide, attenuate upward ; 



seeds nearly black." Bot. Cal. 

 CE. bistorta, Nutt., var. Veitchiana, Hook. 



Wool-waste, N. Chelmsford, rare (Rev. W. P. Alcott). Adv. from 



Cal. 



"More slender; capsule more elongated and narrowed (1 to li 



inches long and less than a line broad), attenuate into a narrow 



beak." Bot. Cal. 



LITDWIGIA, L. 



L. alternifolia, L. SEED-BOX. 



Cambridge (Bigelow's Fl. Bost.) ; Tewksbury (B. D. Greene). 

 Dr. Swan reports at Lowell a form with fascicled, fusiform roots, 

 a character ascribed by the Man. to L. hirtella, Raf. Scarce. 

 Aug.-Sept. 



L. sphaerocarpa, Ell. 



Tewksbury (B. D. Greene); Waltham (C. E. Perkins); Billerica 

 and Concord (Wm. Boott) ; Bedford (Walter Deane) ; Lowell, 

 abundant on the banks of the Concord (Dr. C. W. Swan). Aug.- 

 Sept. 



L. polycarpa, Short & Peter. 



Waltham List ; Winchester, Winter Pond, 1886 (Wm. Boott). Spec- 

 imen in the Boott. Herb. Aug.-Sept. 



L. palustris, Ell. WATER PURSLANE. 

 Common. July-Oct. 



CLARKIA, Pursh. 



C. rhomboidea, Dougl. 



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

 of). Adv. from Eu. For description, see Wood's Bot. & Fl. 



