BICKNELL: FERNS AND FLOWERING PLANTS OF NANTUCKET 67 
Plant greener and thinner-leaved than B. campestris ; at least 
the lower leaves, and often the base of the stem, hispid-pubescent ; 
flowers deeper yellow, rather small, the petals 7-8 mm. long. 
* Brassica Napus L. 
About farms and in old fields, sometimes common as a sur- 
vival of cultivation ; occasionally in grain fields. In full flower 
and with well-developed fruit June 12, 1909. Much stouter and 
taller than the other associated Brassicas, and very conspicuous 
when in full bloom. Wholly smooth, blue-glaucous and rather 
fleshy ; flowers resembling those of Brassica oleracea, very pale 
yellow, large, the petals sometimes 18 mm. long. 
* BRASSICA JUNCEA (L.) Cosson. 
Occasional or frequent about the wharves and streets and in 
outlying old fields. First flowers June 2, 1909; no flowers ob- 
served as late as September. 
Brassica NIGRA (L.) Koch. 
Common about the wharves and fishermen’s houses and in 
waste places, beginning to flower later than 4. juncea. First flowers 
June 10, 1909; remaining in full flower through September. 
* BRASSICA ARVENSIS (L.) Kuntze. 
About farms and in old fields and waste places, now generally 
common but apparently infrequent until recent years. First flowers 
May 31, 1909; continuing to bloom into September. 
* DIPLOTAXIS MURALIS (L.) DC. 
Along a cartway in the western outskirts of the town Sept. IT, 
1899, some flowers remaining. Not observed since. Plant ex- 
haling an unpleasant odor, suggesting that of Geranium Robert- 
anum, 
RapHANus RAPHANISTRUM L., 
Abundant in neglected and in cultivated fields. First flowers 
May 30, 1909; remaining in bloom through September. 
* RAPHANUS saTivus L. 
Met with several times near cultivated ground and in waste 
places. First flowers May 30, 1909; also in full flower at the 
middle of September. 
