78 FLORA OF MOUNT DESERT. FUMARIA, L. Fumitory. F. OFFICINALIS, L. Waste ground, Great Cranberry Isle (R. & R.). Adventive from Europe. CRUCIFERÆ. MUSTARD FAMILY. CARDAMINE, L. BITTER CRESS. C. hirsuta, L. Frequent in brooks and on pond shores. So far as known the Island plants are all glabrous, and in other respects do not correspond to the typical European plant. Whether our common American plant is not specifically distinct seems to be an open question. That it is so distinct, see N. L. Britton, Bull. Torr. Bot. Club, xix. 219. As, however, there appear to be intermediate forms, perhaps it would be wiser to give it only varietal rank. The Mt. Desert forms can perhaps be classified under the three following heads for convenience, although apparently there are no well defined dividing lines between them. (a) Forma Pennsylvanica. C. Pennsylvanica, Muhl. Glabrous; large and leafy; few, if any, radical leaves; pods linear; pedicels somewhat divergent. Roadside ditch between Town Hill and Northwest Cove; near outlet of Great Pond; Intervale Brook (Rand). (b) Like the last, but with widely divergent pedicels, and thicker, much shorter pods. The most common form. Brook, Clark Valley; Cold Brook; Intervale Brook (Rand);— Doctors Brook; Stanley Brook (Redfield); — Deer Brook (R. & R.). (c) A form more nearly corresponding to typical C. hirsuta. Glabrous; radical leaves rosulate; pedicels erect or somewhat spreading; style short and stout; pods variable in length and thickness. Shores of Northwest Arm, Great Pond (Rand, M. L. Fernald). C. parviflora, L. Leaflets mostly linear; radical leaves few or none; pods linear, erect on spreading pedicels. In dry ground, or among moist rocks; rare. Little Duck Island; Flying Mt. (Rand).