SPRING FLORA OF MANHATTAN. 19 



BURSA, Weber. 



B. pastoris, (L.) Wigg. Root leaves clustered, piimatifid. Stem 



leaves clasping by a sagittate base. Flowers white, small. A common 



weed. 



LEPIDIUM, L. 



L. intermedium. Gray. Low, bushy branched. Leaves narrow, 

 entire. Cotyledons incumbent. Dry places, very common. 



L Virginicum, L. Less branched. Leaves toothed. Cotyledons 

 accumbent. Woods, frequent. 



L. Draba, L. Pods heart shaped. Leaves sagittate. Escaped from 

 gardens occasionally. 



27. CAPPARIDACEAE, 



Sepals 4. Petals 4. Stamens 6 or more, equal. Pistil one. 1-celled, 

 with 2 parietal placentfe 



CLEOME, L. 

 Stamens 6. Capsule linear, many seeded, stipitate 



C. serrulata, Pursh. Stem smooth, 1 m. high. Leaves o foliate. 

 Flowers pink. Waste places, not common. 



28. SAXIFRAGACEAE. 

 TRIBE RIBESIOIDE^. 



Shrubs with alternate, simple leaves. Fruit a berry. 



RIBES, L. 

 Calyx .5-lobed. Petals .5. Pistil one. adherent to calyx-tube; ovary 

 1 -celled; ovules numerous. 



E. gracile, Michx. Stems provided with scattered prickles and 

 stronger triple spines below the leaves. Flowers narrow, whitish. 

 Stamens exerted. Woods, frequent. 



29. PLATANACEAE. 

 Flowers monoecious, in heads, naked. Trees with alternate, 

 palmately lobed leaves and sheathing stipules. 



PLATAN US, L. 

 P. occidentaliit. L Leaves sinuate- toothed. A large tree with white 

 bark peeling off in patches. Near streams, frequent. 

 30. ROSACEAE. 

 Sepals 5, united into a cup (often with o alternating bractlets). 

 Petals 5, and stamens numerous, inserted on the calyx tube. Leaves 

 alternate, with stipules. 

 1 . Trees or slirubs. 



Leaves simple. 



Ovary one, 1-celled, free; fruit a drupe. 



Flowers in umbels Primus 



Flowers in racemes Gerasus 



Ovaries 3-5, enclosed in the calyx tube; fruit a pome. 



Flowers pink, fragrant Pyrns 



Flowers white, ill-scented Cratfpgun 



Leaves compound. 



