SPRING FLORA OF MANHATTAN. 27 



(E Missouriensis, Sims. Calyx tube about 1 dm. long. Flowers 

 axillary, 1-1 dm. broad, yellow. Low decumbent perennials with silky 

 pubescenca and broadly 4-winged capsules. Rocky hills, not uucommon. 



(E. serrtdata, Nutt. Stens slender, from a woody base. Leaves linear, 

 denticulate. Flowers axillary, yellow, H-2 cm. wide. Capsule narrow, 

 cylindrical, not winged. Prairie, frequent. 



(E sinuata, L. Stems hairy, decumbent. Leaves lanceolate, sin- 

 uately toothed or pinnatifid. Flowers yellow. Capsule cylindrical, 

 hairy. Prairie, frequent. 



(E. speciosa, Nutt. Stem erect. Leaves more or less pinnatifid. 

 Flowers white or pinkish. Capsule spindle shaped, strongly ribbed. 

 Prairie, frequent. 



GAURA, L 



Flowers much as in (Enothera, but in our species small and in loose 

 spikes. Fruit indehiscent and nut-like, 4-angled. 



G coccinea, Pursh. A canesceut leafy perennial with linear leaves 

 and pink or scarlet flowers. Prairie, common. 



46. UMBELLIFERAE. 



Calyx adhering to the ovary, lobes minute or wanting. Petals and 

 stamens -5, inserted on a disk that crowns the 2-celled, 2-ovuled ovary. 

 Styles 2 Fruit separating into 2 seed-like carpels. Herbs with alternate, 

 usually compound leaves, the base of the petiole expanding and clasping 

 around the stem. Flowers small in simple or compound umbels. 



Stemless; perennial from a thick root Peucedanum 



Leafy stemmed. 



Annual; leaves finely dissected Apium 



Perennial; leaflets ovate or oblong. 



Flowers capitate in umbellet Sanicula 



Flowers long pedicelled in umbellet. 



White Osmorrhiza 



Yellow Polyteenia 



SANICULA, L. 

 Fruit globose, not flattened, densely prickly with hooked bristles. 

 Stems about 1 m. high, glabrous. Leaves palmately parted. Flowers 

 perfect with staminate ones intermixed. 



S Canadensis, L. Staminate flowers few and short pedicelled. 

 Flowers whitish. Low woods, common. 



8. Marilandica, L. Staminate flowers moi*e numerous and long 

 pedicelled. Flowers yellow. Low woods, common. 



APIUM, L. 

 Fruit ovate or roundish, not flattened. Flowers white. 

 A. patens, (Nutt.) Wats. A slender, divaricately branched annual 

 (3-6 dm.), with leaves finely dissected into filiform lobes, and tuberculate 

 fruit. Prairie, frequent. 



OSMORRHIZA, Raf. 

 Fruit narrow, not flattened, attenuate at base, bristly. Flowers 

 white. 



