478 



SYN6ENESIA NECESSARIA 



4. Paniculata. 



Mich 



Stem branching, pa- 

 , , niculate at the summit, 

 and with the petioles 

 villous; leaves green 

 bipinnatifidis, laciniis 1 on each surface, bipin- 

 lanceolatis; fructibus natifid, the segments 

 aggregatis,pusillis,glo- 1 lanceolate; fruit some 



A. caule ramosissi- 

 mo, superne paniculato 

 petiolisque villosis; fo- 

 liis utrinque viridibus 



laciniis 



boso-obovatis 

 ermibus. 



f 



Mich. 2. p. 183 



subin- I what clustered, small, 



obovate, slightly arm- 

 ed. 



Sp. pi. 4. p. 376. Pursh, 2. p. 581. Nutt. 2. p. 186. 



Iva Monophylla, Walt. p. 232. 



Root annual. Stem two to four feet high, branching, pubescent and 

 hairy, somewhat scabrous. Leaves alternate, the lower compoundly, the 

 upper simply pinnatifid, the segments all acute, somewhat hairy and sca- 

 brous. Flowers in simple racemes, terminal and axillary, the lower fertile, 

 the upper sterile. Calyx of the sterile florets turbinate, ten-flowered, irre- 

 gularly ten-toothed. Corolla globose. Stamens five, united on a pedicel. 

 Fruit slightly muricate near the summit. 



Grows in cultivated ground — very common. 



Flowers July — September. 



XANTHIUM. Gen. Pl. 1426. 



Monoicum. Floris 



Monoecious. 



Male 



masculi — receptacuhim \ florets — receptacle chat- 

 paleaceum; antherce fy; anthers approxi 



approximatae non coa- mate 



, not united; invo- 



leaved. 



litae; involucrum poly- lucrum many 

 phyllum, imbricatum, imbricate, many fl^^" 

 multiflorum. Floris \ ered. ¥ emdXe flor ets 



2-leaven, 



foem. involucrum 2- involucrum 



phyllum 



r 



olla 



2-florura; co- 1 2-flowered 

 drupa 



3 



Sicca 



corolla 0; 



drupe dry, muricate 



muricat'a, 2-fida. Nux ! cleft; nut 2-ceIled. 

 2.locularis. 



2- 



