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a single sessile flower; leaves linear; flowers 

 rose-color. . Niles. Spring. 



4. P. NODOSUM Pers. Flowers spicate; 

 bracts scarious, each bract protecting a fasci- 

 cle; stamens 6; styles 2, included; leaves cune- 

 ate at base; flowers pale. 0. Marine Hos- 

 pital. Spring. 



5. P. MUHLENBEEGII Watson. Flowers spi- 

 cate; bracts scarious, each bract protecting a 

 a fascicle; stamens 5; style 2-cleft, exserted; 

 leaves cordate at base; flowers rose-color. 2. 

 Marine Hospital. Spring. 



6. P. CONVOLVULUS L. Stem twining; leaves 

 hastate; flowers pale. 0. Cultivated grounds. 

 Summer. 



Ballast weed, introduced from Europe. 

 3, Eriogonum Michx. 



Involucre co-flowered, campanulate, slightly 

 angulate, 6-dentate. Flowers pedicillate, 

 exserted, seated on a receptacle with scarious 

 bracts. Perigonium 6-parted, 2-seriate. Sta- 

 mens 9, in pairs opposite to the external lobes; 

 singly to the internal ones. Styles 3; stigmas 

 capitate. Fruit a 3-angled, rarely a lenticular, 

 akene. Peduncles 2-3-chotomous. 



1. E. ANGULOSUM Benth. Involucre nerve- 

 less, hemispherical ; flowers pale. 0. Niles. 

 Spring. 



