88 THE AMERICAN MIDLAND NATURALIST. 
Papaveraceae. Poppy Family. 
Sanguinaria canadensis BLOODROOT. 
Woods. Frequent. Apr. 30 (28). Apr. 3 in 1910. 
Papaver somniferum VL. , COMMON POPPY. 
Occasionally escaped in yards or streets. 
Papaver rhoeas \. CORN POPPY. 
Occasionally escaped in yards or streets. 
Fumariceae. Fumditory Family. 
Capnoides aureum (Willd.) Kuntze. GOLDEN CORYDALIS. 
Woods and thickets. Common. May 10 (9). 
Capparideae. Caper Family. 
Cleome serrulata Pursh. ROCKY MOUNTAIN BEE PLANT. 
Prairie near railroad (introduced?); Stevens in 1920. July 5. 
Polanisia trachysperma 'T. & G. CLAMMY WEED. 
A large colony in some gravel along N. P. Ry. west of town in 
1910, but has nearly disappeared. July 20. 
Brassicaceae. Mustard Family. 
Lepidium densiflorum Schrad. PEPPER GRASS. 
Fields and roadsides. Common. May 30 (28). Records range 
from May 13 to June 13. 
Lepidium virginicum I,. 
Yards, occasionally introduced but not persisting. 
Thlaspi arvense VL. FRENCHWEED. PENNY CRESS. 
Fields and roadsides. Common. Apr. 20 (22); earliest, March 
22, 1910. Many seedlings pass the winter in various stages, often 
after beginning to flower. So far as I have noticed, the flowers which 
are just opened when winter begins do not develop in the spring, 
but well developed flower buds open with the first warm weather. 
Bursa bursa-pastoris (1,.) Britton. SHEPHERD’S PURSE. 
Fields and roadsides. Frequent. Apr. 10 (9). 
Gamelina sativa Crantz. FALSE FLAX. 
Roadsides. Occasional. 
Camelina dentata Pers. ROUND-SEEDED FALSE FLAX. 
Roadsides. Occasional. 
Neslia paniculata (1,.) Desv. BALL MUSTARD. 
Roadsides. Occasional. 
Radicula palustris (L.) Moench. ‘MARSH YELLOW CRESS. 
Low places in fields, river-banks, etc. Common. June 20 (19). 
