Orel. 2.] SYNGENESIA. 155 



390. CHRYSoCOMA. Recept. naked. Down rough. Cal. imbri- 



cated, hemispherical. Style scarcely longer than the florets. 

 388. BlDENS. Recept. chaffy. Down rough with reversed prickles. 

 Cal. of many parallel, channelled scales. Cor. occasionally 

 radiated. 



391. DIoTIS. Recept. chaffy, with hairy-tipped scales. DownO. 



Cal. imbricated, hemispherical. Flo?'ets with 2 spurs, which 

 border the seed. 



Tanecetum. Senecio 1. Aster 1. Anlhemis 2. 



Order II. POLYGAMIA SUPERFLUA. Florets 

 all fertile, though those of the circumference have no 

 stamens. 



* Corolla of the marginal florets obsolete, or wanting. Discoid. 



392. TANACeTUM. Recept.naked. Seed with a membranous crown. 



Cal. imbricated, hemispherical. Florets of the circumference 



3-cleft, obsolete, sometimes wanting. 

 395. CONyZA. Recept. naked. Down rough. Cal. imbricated, 



roundish. Florets of the circumference 3-cleft. 

 394. GNAPHaLIUM. Recept. naked. Down rough, or feathery. 



Cal. imbricated ; scales filmy, coloured. Ft. of the circumf. 



awl-shaped. 



393. ARTEMISIA. Recept. either naked or hairy. Down 0. Cal. 



imbricated ; scales rounded, converging. Fl. of the circumf. 

 awl-shaped, entire. 

 Tussilago 2. 



** Corolla of the marginal florets ligulate. Radiant. 



404. BeLLIS. Recept. naked, conical. DownO. Cal. hemispherical ; 



scales equal. Seed obovate. 

 407. MATRICARIA. Recept. naked, nearly cylindrical. DownO. 

 Cal. nearly flat, imbricated ; scales membranous at the edges. 



405. CHRYSANTHEMUM. Recept. naked, rather convex. Down 0. 



Cal. hemispherical, imbricated ; scales with a dilated mem- 

 branous border. 



406. PyRETHRUM. Recept. naked. Seed crowned with a border. 



Cal. hemispherical, imbricated ; scales rather acute, membra- 

 nous at the edges. 

 403. DOR6NICUM. Recept. naked. Down simple ; wanting on the 



seeds of the radius. Cal. a double row of equal scales, longer 



than the disk. 

 401. INULA. Recept. naked. Down simple. Cal. imbricated. Flor. 



of the radius very numerous, linear. Anth. with two bristles 



at the base. 

 396. ERlGERON. Recept. naked. Down simple. Cal. imbricated. 



Florets of the radius numerous, linear, very narrow. Anthers 



simple. 



