268 
gonnatum. 4, 
After if- 
a 
trifcliae 
tum. 
5: 
6. 
‘SYNGENES. POLYG. NECESS. Silphium. 
Square-ftalk’d Silphium. 
Nat. of North America. 
Cult. 1766, by Peter Collinfon, Efq. 
Fi, July ——Odober. : ; SES 
S. foliis oppofitis feffilibus perfoliatis, caule tereti fca- 
bro. Linn. mant. 574. 
Round-ftalk’d Silphium. 
Nat. of North America. 
Introd. 1765, by Mefirs. Kennedy and Lee, 
Fi. July ——O€oober. H, 4. 
S. foliis indivifis feffilibus oppofitis : inferioribus alter- 
nis. Sp. pl. 1302, 
Hairy-ftalk’d Silphium. 
Nat. of North America. 
Cult. 1732, by James Sherard, M.D, Dill. elth. 42- 
t. 37: fr 42. 
Fi}, July —September, H. 4. 
S. foliis ternis. Sp. pi. 1302, 
Three-leav’d Silphium. 
Nat. of North America. 
Cult, 1759, by Mr. Ph. Miller. AGU. did. edit. 7. #1 
Fi, July ——Odober. H. 4. 
POLYMNIA. Gen, pi.987. 
Recept. paleaceum. Pappus nullus. Cal. exterior 4 f 
§-phyllus :. interior 10-phyllus: foliolis concavis- 
Uvedalia, 1. P. foliis oppofitis haftato-finuatis, Sp, pi. 1 303: 
. 
Broad-leav’d Polymnia. 
Nat. of Virginia, 
Cult, 
