SYNGENESIA, 
650. AMELLUS. Recept. paleaceum. Pappus pilosus. 
Cor. radii indivise. Cad. imbricatus. 
651. VERBESINA, Recept. paleaceum. Pappus arista- 
. tus, Flosc. radii circiter 5, Cal. duplici ordine. 
652. ZINNIA. Recept. paleaceum. Pappus aristis 2. 
erectis. Radius 5-florus, persistens. pi imbrica- 
tus, ovato-cylindricus, - 
HI. FRUSTRANEA. 
Hie BIDENS. Recept. paleaceum: paleis extimis quasi 
— calycem cominunem constituentibus. . Pappus aristis 
2.s. 4. retrorsum. Flores floscnlosi aut etiam ra- 
diati : radiis neutris aut imperfecte masculis. Cal. 
subzequalis, calyculatus, . 
654. COREOPSIS. Recept. et Cal. comm. Bidentis. Flores 
radiati : radiis neutris, prolixis (luteis), Sem. com- 
pressa aut emarginata, aut bidentata, aut etiam bise- 
tosa: setis inermibus nec retrorsum aculeatis. 
655. HELIANTHUS. Recept. paleaceum, planum. Pap- 
pus diphyllus, caducus, Cal, imbricatus, subsquar- 
rosus, foliaceus. 
656. GALARDI!A. Recept. paleaceum, hemisphericum. 
Pappus paleaceus, polyphyllus Cor. radii 3-partitæ. 
Cal. polyphyllus, planus. 
657. RUDBECKIA. Recept. paleaceum, conicam. Pap- 
pus margine 4-dentato. Cal. duplici ordine squa- 
marum. 
658. CENTAUREA. Recept. setosum. Pappus pilosus. 
, Cor. radii infundibuliformes, irregulares. Cal. varius, 
IV. NECESSARIA. 
659. CHAPTALIA. Recept. nudum, Pappus capillaris. 
Flosculi radii in duplici serie difounés, feminei. 
œ — Flosculi disci masculi bilabiati. 
660. SILPHIUM. Recept. paleaceum. Pappus marginato- 
ar Cal. squarrosus, foliaceus, Sem. com- 
ressa, obcordata, marginata, 
66 1 POLYMNIA. Recept. paleaceum. Pappus nullus, 
` Cal. duplex : exterior 4—5-phyllus ; interior 10-phyl- 
lus, foliolis concavis. 
662. CHRYSOGONUM, Recept. paleaceum. Pappus 1- 
