MIDDLESEX FLORA. 



"Lower leaves runcinate-pinnatifid, laciniae dentate with auriculate 

 base, auricle ascending; upper leaves pinnate, pinnae all narrowly 

 linear ; sepals widely spreading ; pods and pedicels of about equal 

 diameter, spreading." 



Koch, Syn. Flor. Germ. 



S. Lceselii, L. 



Westford, woollen-mill yard, 1884 and 1885 (Dr. C. W. Swan). 

 July- Aug. Adv. from Eu. 



"Stem 1-3 ft. high, hispid with stiff hairs, as are also the lower leaves. 

 Leaves runcinate-pinnatifid, the terminal segment very large, has- 

 tate ; calyx patent ; pods ascending, twice the length of the spread- 

 ing pedicels, the younger shorter than the convex cluster." 



Wagner, Deutsche Flora. 



S. incisum, Engelm. 



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

 herb. of). Adv. from Cal. 



BRASSICA, Tourn. 



B. SINAPISTRUM, BoisS. CHARLOCK. YELLOW MUSTARD. 



Westford, Medford, Ashland, et al. Rather common in waste 

 grounds. June-Aug. Nat. from Eu. 



B. ALBA, Gray. WHITE MUSTARD. 



Groton and Dracut, waste-heaps (Dr. C. W. Swan) ; Somerville 

 (C.E.Perkins). June-July. Nat. from Eu. 



B. NIGRA, Koch. BLACK MUSTARD. 



Persistent about dwellings as a relic of cultivation. Rather com- 

 mon. June-Aug. Nat. from Eu. 



B. campestris, L. KALE. 



Persistent in old gardens, and common on "dumps." June-July. 

 Int. from Eu. The cultivated forms of B. campestris, B. Rapa, L. 

 Turnip, and B. Napus, L. Rape, are often persistent. For de- 

 scription, see Wood's Bot. & Fl. 



DRAB A, L. 

 *D. arabisans, Michx. 



Concord; introduced from Vermont by Minot Pratt. May-June. 

 D. Caroliniana, Walt. 



Woburn (C. E. Perkins). Precise locality now unknown. May. 

 D. verna, L. WHITLOW GRASS. 



West Medford (Wm. Boott). This rare plant has appeared every 



spring for many years in the gravelly paths of a garden. No other 



locality is known. Apr.-May. 



ALYSSUM, Tourn. 

 A. calycinum, L. 



Medford (G. E. Davenport); Somerville (C. E. Perkins). May. 

 Adv. from Eu. 



