10 MIDDLESEX FLORA. 



RAPHANUS, L. 



K. RAPHANISTRUM, L. WILD RADISH. JOINTED CHARLOCK. 

 A common weed in cultivated fields. May- July. Nat. from Eu. 



HESPERIS, L. 



H. MATRONALIS, L. ROCKET. 



Reading, escaped (W. H. Manning) ; Maiden, persistent for ten years 

 in one locality and spreading (F. S. Collins) ; Stoneham (B. F. 

 Gordon) ; Arlington (L. L. Dame). Appears to be sparingly 

 established. June. Nat. from Eu. For description, see Wood's 

 Bot. &F1. 



TROPIDOCARPUM, Hook. 



u Pod linear, flattened laterally, often one-celled by the disappear- 

 ance of the narrow partition ; valve carinate, one-nerved. Seeds in 

 two rows, minute, flattened, not winged; cotyledons incumbent. 

 Style short. A low, slender, hirsute, branching annual, with 

 pinnately divided leaves, and yellow solitary axillary flowers." 

 Bot. Cal. 



T. gracile, Hook. 



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

 of). Adv. from Cal. 



" Stems weak, 2 feet high or less ; leaves pinnatifid or rarely 

 2-pinnatifid, with narrow or linear segments ; flowers in the axils 

 of the upper bract-like leaves ; petals li to 3 lines long, nearly 

 twice longer than the obtuse sepals ; pods 6 to 20 lines long, more 

 than a line broad, pointed at both ends, ascending on slender 

 spreading pedicels 10 to 20 lines long." Bot. Cal. 



VIOLACE/E. VIOLET FAMILY. 



V. rotund if olia, Michx. ROUND-LEAVED VIOLET. 



Townsend (Miss H. E. Haynes) ; Frarningham, rare (Rev. J. H. 



Temple) ; Ashby, rare (L. L. Dame) ; Concord, introduced from 



Vermont by Minot Pratt. April-May, 

 V. lanceolata, L. LANCE-LEAVED VIOLET. 



Common. April- June. 

 V, primulifolia, L. PRIMROSE-LEAVED VIOLET. 



Less common than the preceding. April-June. 

 V. blanda, Willd. SWEET WHITE VIOLET. 



Common. April-June. 

 V. ODORATA, L. ENGLISH VIOLET. 



Ashland, sparingly naturalized (Rev. Thos. Morong; specimen 



in herb. of). Int. from. Eu. 



