472 



SYKGENE3IA NECESSARIA 



ternate. 



Exterior scales of the 



hairy, scabrous, ovate, three to five lobecl, tapering at base into a 

 petiole with sinuate wings t^sp to three inches long. Flowers in a loose 

 terminal panicle, the branches opposite or ternate. 

 involucrura much larger, the interior ovate, ciliate, somewhat scabrous, the 

 interior lanceolate, acuminate, villous, embracing the germs, and forming in 

 fact only the exterior series oYthe scales of the receptacle. Florets of the 

 ray ten, lanceolate, three-toothed, yellow, about an inch long; of the disk 

 very numerous. Seeds nearly spherical^ somewhat compressed, glabrous- 

 Heceptacle flat, chaffy. ^ 



Grows in dry soils — in old pastures common. 



Flowers June — August. 



lum* 



CHRYSOGONUM. Gen. Pl. 1337- 



Involucrum 5-phyl* I Involucrum 5 



paleaceum. 



Receptaculum 



Pappus Pap 



Receptacle chaffy 



14eaved 



y 



3 



1-phyllus, 3-dentVtus. I tootfied. Seed enfold 

 Semina caliculo 4- | ed in a 4-leaved caly 

 pLyllo involuta. 



. 1. VlRGINIANUM. 



b 



Sp. pl. 3. 233r. Walt* p. 217. Mich. 2. p. 148. Pursli, 2. p. 579- 

 Nutt, 2. p. 184- 



Root perennial, stoloniferous. Stem six to twelve inches long, decuin- 

 bentj very villous. Leaves opposite, oblong, lanceolate or oval, crenately 

 toothedj triplinerved, tapering to a long petiole, villous. Flowers solitary, 

 generally terniinal. Scales of the involucrum five, oblong, somewhat ellip* 

 tic, villous. Florets of the ray five, five to eight lines long, wide, yellow; 

 of the disk numerous. Seed four-angled, compressed, a Uttle hairy, crowned 

 at the summit with a short three-toothed pappus, open or divided on the 

 interior side, and enveloped by a four-leaved calyx, of which the exterior 

 leaf is large and infolds the seed and the other tliree. 



Grows in rich dry soils, creeping on tlie surface. 



Flowers April — June. 



GYMNOSTYLES. Jussieu. 



Calyx 



DOlVDhvliU 



Calyx many 



leaved 



ordiiie simplici. Flos- I in a simple series. Fe- 

 culi foeminei ^\ye^i3\\, \ mdXo florets apetaious 



V 



