SPRING FLORA OF MANHATTAN. 29 



APOCYNUM, L. 



Fruit 2 long and slender follicles. Flowers white, cymose. 

 A. cannabinum, L. About 1 m. high. Leaves oval. Flowers small, 

 in close, terminal cymes. Low ground, frequent. 



51. ASCLEPIADACEAE. 



Characters about as in the last order but anthers connected with 

 stigma. Leaves opposite or alternate. 



ASCLEPIODORA, Gray. 



Corolla lobes 5, ascending. Inside there is a crown consisting of 5 

 spreading, hooded bodies. Flowers in umbels. 



A. viridis, (Walt) Gray Stem low. Leaves alternate. Flowers 

 2-3 cm. broad, green with purple crown. Prairie, not common. 

 ACERATES, Ell. 



Corolla lobes 5, reflexed. Crown present. Flowers small, greenish, 

 in compact umbels. 



A. lanuginosa, (Nutt.) Dec. A low, hairy perennial with opposite or 

 scattered leaves and a single umbel terminating the stem. Prairies, 

 rare. 



52. CONVOLVULACEAE. 



Sepals 5. Corolla .5-lobed, covolute. Stames .5, inserted on the corol- 

 la tube alternating with its lobes. Ovary 2-celled, 4-ovuled. Herbs 

 with alternate leaves and erect or usually twining stem. Fruit a cap. 

 sule. 



CONVOLA^ULUS, L. 



Corolla funnel form, showy. Style one. 



C. Septum, L Stem usually twining, glabrous. Leaves halberd- 

 shaped. Corolla white, 4 5 cm long. Moist soil, common. 



C repens, L Stem usually trailing, pubescent. Corolla pinkish or 

 white. Low ground, frequent. 



EVOLVULUS, L. 



Corolla small, nearly rotate. Styles 2. 



E pilosus, Nutt. A low, erect, silky hairy herb with crowded, nar- 

 row leaves and small, blue flowers (i cm. broad). Prairie, frequent. 

 53, POLEMONIACEAE. 



As in the preceding order but ovary 3-celled. Herbs, not twining. 

 PHLOX, L. 



Corolla salver-form. Perennials with opposite, entire, sessile leaves 

 and cymose inflorescence. 



P. divaricnta, L. Stems ascending from a decumbent base. Leaves 

 oblong to ovate. Corolla pale blue. Woods, frequent. 



P. pilosa, L. Stem erect. Leaves linear. Corolla pink. Prairie, 

 frequent. 



54. HYDROPHYLLACEAE. 



As in the foregoing orders but ovary 1-celled with 2 parietal placentae. 

 Styles 2, more or less united. Herbs. 



