Class XIX. SYNGENESIA. 665 
1800. Rudbcckia. Recept. paleaceous, conical. Pappus with a 4-toothed rim. In vol. with a double row of 
scales. 
1801. Galnrdia. Recept. paleaceous, hemispherical. Pappus paleaceous, many-leaved. Invol. iml)ricate<l, 
niany-leavcd, flat. Rays 3-parted. 
1802. Tithonia. Invol. many-lcaved, cylindrical. Rays 3-toothcd. Recept. i)aleaccous, convex. Pappus 
paleaceous, 5-leaved. 
J803. Cosnica. Recept. paleaceous. Pericarps 4-cornered. I'appus with 2 or 3 awns. Invol. double, each 
1-leaved, 8-parted. 
1804. Coreopsis. Recept. paleaceous. Pericarps compressed, emarginate. Papi)us witli 2 horns. Invol. 
double, each many-leaved. 
1805. Simsia. invol. subcylindrical, nearly equal, with linear lanceolate incumbent scales. Recept. jjalca- 
ceous. Pericarps flattish, somewhat edged, each edge awned. 
1806. Osmites. Recept. paleaceous. Pappus obsolete. Florets of ray ligulate. Invol. imbricated scarious. 
1807. Encelia. Recept. paleaceous. Pappus O. Pericarps vertical, flat, with a ciliated edge, Invol. im- 
bricated. 
1808. Sclerocarpus. Recept. paleaceous. Pappus O. Invol. double, each 3-leaved. 
1809. Cullumia. Recept. favose. Pericarps smooth. Pappus O. Invol. 1-Ieavcd, covered with imbricated 
leaflets. 
1810. Berckheya. Recept. favose. Pericarps villous. Pappus paleaceous (sometimes bristly-paleaceous, 
ciliated). Invol. 1-leaved, covered with imbricated leaflets. 
1811. Didelta. Recept. favose, inclosing the pericarps. Pappus many-parted, setaceous, paleaceous, toothed. 
Invol. 1-leaved, covered with leaflets, the exterior very large. 
1812. Gorteria. Recept. scrobiculate. Pappus a ciliated edge. Invol. 1-leaved, covered with imbricated 
leaflets, of the fruit indurated, connivent, deciduous. 
1813. Gazania. Recept. naked, or alveolate. Pericarps very villous. Pappus hairy-paleaceous. Invol. 
1-Ieaved, the tube naked, or covered with imbricated leaflets. 
1814. Cryptostemma. Recept. favose. Pappus paleaceous, covered by the entangled wool of the pericarp. 
Invol. imbricated. 
1815. Arctotheca. Recept. favose. Pappus O. Invol. imbricated. 
1816. Sphenogyne. Recept. with distinct palece. Pappus paleaceous, simple. Stigmas with a dilatctl trun- 
cated end. Invol. imbricated, the inner scales or all with a dilated scarious end. 
1817. Zoegea. Recept. setose. Pappus setaceous. Rays ligulate. Invol. imbricated. 
1818. Leuzea. Invol. imbricated, spherical, not spiny. Recept. bristly. Pappus feathery, in many rows. 
Florets all hermaphrodite. 
1819. Centaiirea. Invol. scaly. Recept. bristly. Corollas of the ray infundibuliform, irregular, longer than 
those of the disk. Pappus simple. 
1820. Galactites. Invol. imbricated, with somewhat squarrose spiny scales. Recept. favose. Pappus 
feathery, deciduous. 
1821. Wedelia. Invol. 5-leaved, with broad leafy segments. Recept. paleaceous. Florets of the centre 
generally abortive, of the ray many, oval, 2-3-fid. Stigmas setaceous. Pappus stipitate, membranous, tooth- 
letted. 
Order 4. . y NECESSARIA. 
Florets of the ray female fertile : of the disk male. 
1822. MUleria. Recept. naked. Pappus O. Invol. of 3 valves. Ray halved. 
1823. Baltimora. Recept. paleaceous. Pappus O. Invol. cylindrical, many-leaved. Ray 5-flowered. 
1824. Silphium. Recept. paleaceous. Pappus with a 2 horned edge. Invol. squarrose. 
1825. Trixis. Invol. imbricated. Cor. of ray 3-fid. Recept. paleaceous. Pappus O. Pericarps villous at 
end. 
1826. Polymnia. Recept. paleaceous. Pappus O. Invol. double : outer 4 or 5-leaved ; inner 10-leaved, with 
common leaflets. 
1827. Chrysogonum. Invol. 5-leaved. Recept. paleaceous. Pappus 1-Ieaved, 3-toothed. Pericarps with a 
little 4-leaved calyx. 
1828. Melampodium. Recept. paleaceous, conical. Pappus 1-leaved, vulviform. Invol. ."j-leaved. 
1829. Chaptalia. Recept. naked. Pappus capillary. Florets of the ray in a double row, deformed ; of the 
disk bilabiate. 
1830. Calendula. Recept. naked. Pappus O. Invo. many-leaved, equal. Pericarps of the disk mem- 
branous. 
1831. Arctotis. Recept. setose-alveolate. Pericarps half 2-celled, or 2-furrowed at the back. Pappus palea- 
ceous. Invol. imbricated, with scales scarious at end. 
1832. Osteospermum. Recept. naked. Pappus O. Invol. many-leaved. Pericarps globose, colored, bony. 
1833. Othonna. Recept. naked. Pappus hairy. Invol. 1-leaved, many-cut. 
1834. Hippia. Recept. naked. Pappus O. Pericarps with very broad edges, naked. Invol. hemispherical, 
somewhat imbricated. Florets of ray 10, obsoletely trifld. 
1835. Saliva. Invol. 7-leaved, leaflets with imbricated edges, the 3 outer largest. Ray none. Recept. very 
small, somewhat villous. Pericarps compressed, surrounded by a membrane, crowned by 2 prickles and the 
style. 
1836. Psiadia. Recept. naked. Pappus hairy, sessile. Invol. imbricated, ovate. Florets of ray short. 
1837. Erioceplialus. Recept. paleaceous. Pappus O. Invol. double : inner 1-leaved ; outer S-leaved. 
1838. Filago. Recept. paleaceous. Pappus O. Invol. imbricated. Female florets mixed among the scales 
of involucre. 
1839. Micropus. Recept. paleaceous. Pappus O. Invol. calyculate. Rays none. Female florets en- 
wrapped in the scales of involucre. 
1840. Partkenium. Recept. paleaceous, flat. Pericarps obovate, nearly naked. Invol. 5-leaved. 
1841. Jva. Recept. pilose. Pericarps naked, blunt. Invol. 3-leaved. Florets of ray 5. Styles 2, long. 
1842. Acicarpha. Invol. 5-parted. Cor. all tubular. Recept. paleaceous, the palea being united with tlie 
pericari)s after flowering. Pappus O. Stamens half-separate. 
Order 5. ^^JJ^ SEGREGATA. 
Each floret having its own peculiar involucre. 
Elcphanfopus. Invol. 4-flowered. Florets ligulate, hermaphrodite. Recept. naked. Pappus setaceous. 
1844. (Edera. Invol. many-flowered. Tubular florets hermaphrodite, and one or more female and ligulate. 
Recept. jialeaceous. Pappus with many paleae. 
1845. Fluveria. Partial invol. 2-5-leaved, 2-5-flowered. Common invol. imbricated with unequal scales. 
Florets tubular, 1 often ligulate. Pappus O. Recept. naked. 
184fi. Stcebe. Invol. 1-flowered. Floret tubular, hermaphrodite. Recept. naked. Pai)pus feathery. 
1847. Naucnbergia. Partial invol. 2-leavcd, l-flowercd ; common invol. leafy. Pappus O. Receptacle 
setose. 
