664 
SYNGENESIA. 
Class XIX. 
1747. Podolcpis. Recept. naked. Pappus hairy. In vol. imbricated, scarious, hemispherical : scales un- 
guiculatc. 
1748. Chcctanthera. Invol. many-leaved, ciliated. Florets of ray linear, 3-toothed, witii a fine bifid spiral 
segment at the divisions. Anthers spurred at base. Recept. naked, flat. Pappus hairy. 
1749. Arnica. Recept. naked. Pappus simple. Invol. with equal leaves. Florets of ray generally with 
5 filaments without anthers. 
17.01). Gcrbcria. Florets bilabiate, those of the ray ligulate. Invol. imbricated, coriaceous. Recept. flat, 
nakeil. l'api)us with long bearded i)aleas. 
Dorunicuvi. Scales of tiie invol. in 2 equal rows, longer than the disk. Recept. naked. Pericarps of 
the disk crowned with a simi)le pappus, tiioso of tiie ray without a pappus. 
17.'>-. Pcrdlcium. Recept. naked. Pappus hairy. Florets 2-lipped. 
1753. Tctragonolhcca. Recept. paleaceous. Pappus O. Invol. 1-leaved, 4wcornered, 4-parted. 
1754. Ximenesia. Recept. paleaceous. Pappus O. Pericarps of ray naked, emarginate ; of the disk winged. 
Invol. many-leaved, nearly equal. 
1755. Hckniinn. Recept. naked , of the ray paleaceous. Pappus 5-awned. Invol. 1-leaved, many-parted. 
Florets of ray half-trifid. 
175(). Bcllis. Invol. hemispherical, its scales equal. Recept. naked, conical. 
1757. Bcllium. Recept. naked. Pericarps conical, with a paleaceous 8-leaved crown and awned pappus. 
Leaves of invol. equal. 
1758. Dahlia. Recept. paleaceous. Pappus O. Invol. double : outer many-leaved ; inner l-leaved, 
8-partcd. 
1759. Bcchcra. Invol. double : outer many-leaved ; inner 8-leaved. Recept. naked. Pappus hairy. 
1760. Tagctcs. Recept. naked. Pappus with 5 erect awns. Invol. simple, 1-leaved, 5-toothed, tubular. 
F'lorcts of ray 5, persistent. 
17()1. Hctci ospcrinum. Recept. naked. Outer grains compressed with a membranous edge ; inner oblong 
with two awns. Invol. double : outer 4-parted j mner many-leaved. 
1762. Schkiihria. Recept. naked. Pappus paleaceous. Invol. 5-leaved. Florets of ray solitary. 
17fi3. Pedis. Recept. naked. Pappus with 3 or 5 awns. Invol. 5-leaved. Florets of ray 5. 
1764. Longchampsia. Differs from Pectis and Leysera, in having a double pappus, the exterior of which is 
edged, the inner feathery. 
1765. Leysera. Recept. somewhat paleaceous. Pappus paleaceous : of the disk feathery. Invol. scarious. 
1766. Sctloa. Invol. imbricated, ovate. Recept. naked. Pappus O. Female florets inconspicuous, mixed 
among the leaves of the involucrum. 
1767. Itclhania. Recept. paleaceous. Pappus membranous, cylindrical, short. Invol. imbricated, scarious. 
Rays numerous. 
1768. Zinnia. Recept. paleaceous. Pappus with 2 erect awns. Invol. ovate, cylindrical, imbricated. Florets 
of ray 5, jiersistent, entire. 
1769. Chrysanthemum. Invol. hemispherical, imbricated with scales whose borders are membranous. 
Recept. naked. Pappus none. 
1770. Pyrethrinn. Recept. hemispherical, imbricated with scales whose borders are membranous. Recept. 
naked. Pericarps crowned with a membranous margin. 
1771. Matricaria. Invol. hemispherical or almost plane, imbricated with scales whose borders are mem- 
branous. Recept. naked, almost cylindrical. Pappus none. 
1772. Boltonia. Recept. favose, hemispherical. Pappus toothed, awned, somewhat 2-horned. Rays nume- 
rous. Invol. imbricated. 
1773. Lidbeckia. Recept. naked. Pappus O. Pericarps angular, with the lowest joint of style persistent. 
Rays numerous. Invol. many-parted. 
1774. Cenia. Invol. in fruit turbinate, multifid. Florets of ray very numerous, short. Recept. naked. 
Pericarps compressed. 
177.5. Cotula. Recept. nearly naked. Pappus margined. Florets of disk 4-fid, of the ray scarcely any. 
1776. Grangea. Invol. imbricated, spreading. Marginal florets 3-toothed. Recept. hemispherical. Peri- 
carps with a toothed edge at top. 
1777. Anacyclus. Recept. paleaceous. Pappus emarginate. Pericarps with membranous edges. 
1778. Anthemis. Invol. hemispherical, its scales nearly equal, their margins scarious. Recept. convex, 
chaffy. Pericarps crowned with a membranous border or pappus. 
1779. Centrospermum. Invol. hemispherical, of many imbricated, round, scarious scales. Recept. naked. 
Pappus spiny. Outer pericarps cymbiform, smooth. 
1780. Sanvitalia. Recept. paleaceous. Pericarps of ray with 3 awns : of the side naked, warted ; of the disk 
winged. Invol. imbricated, flat. 
1781. Achillea. Invol. ovate, imbricated, unequal. Recept. plane, chaffy. Florets of the ray 5-10, roundish, 
obcordate. Pericarps naked. 
1782. Trida.v. Invol. cylindrical, imbricated, with ovate oblong scales. F'orets of ray 3-parted. Recept. 
paleaceous. Pappus hairy, simple. 
1783. A7Hcllus. Recei)t. paleaceous. Pappus simple. Invol. imbricated. Florets of ray undivided. 
1784. Starkca. Recept. hirsute. Pappus sessile, hairy. Invol. imbricated. 
1785. Columellia. Invol. cylindrical, imbricated. Florets of ray undivided. Recept. naked, favose. Pappus 
a toothed edge. 
1786. Eclipla. Recept. paleaceous. Pappus O. Florets of disk 4-fid. 
1787. Meycra. Invol. 4-leaved, the 2 inner smallest. Recept. small, paleaceous, 2 paleas enveloping the 
pericarp, keeled. Pappus O. 
1788. Chrysanthcllum. Invol. cylindrical, about as long as florets, scaly at ba^e. Recept. paleaceous. Florets 
numerous, linear, 2-toothed, short, of the centre few, and generally abortive. Pericarps naked, roundish, 
furrowetl, with an entire edge. 
1789. Sicgcsbeckia, Recept. jialeaceous. Pappus O. Outer invol. 5-leaved, inner spreading. Ray halved. 
1790. Ve'rbesina. Recept. paleaceous. Pappus awned. Invol. in one row. Florets of the ray about 5. 
1791. Syncdrella. Invol. generally of 2 leaves. Florets flosculous. Recept. obsolete, paleaceous : palese 
glumaccous ; the outer o\ ate. Pericarps oval, flat, edged ; the central dissimilar, J .near, oblong, with 2 or 3 awns. 
1792. Gallnsogca. Recept. i)aleaceous. Pappus many-leaved, paleaceous. L.vol. imbricated. 
1793. Acmclla. Invol. simple, with a few somewhat leafy divisions. Recept. oblong, paleaceous. Heads 
radiant. Pericarps 4-cornercd, truncate at end, naked. 
1794. Zaluzania, Invol. with distinct, somewhat ovate, equal segments. Head radiant. Recept. conical, 
paleaceous ; ])alea; membranous, trifid, involving the pericarps, which are 4-cornered and naked. 
1795. Pascalia. Recept. paleaceous. Pericarps drupaceous. Pappus a toothed rim. Invol. imbricated. 
1796. Heliopsis. Invol. imbricated, with ovate lined squama;. Gor. of ray linear, large. Recept. paleaceous, 
conical, with lanceolate paletc. Pericarps 4-cornered. Pappus O. 
1797. Buphthalmum. Recept. paleaceous. Pajjpus an obsolete rim. Sides of pericarps, especially of the 
ray, edged. 
Order 3. ^^K^^ FRUSTRANEA. 
Florets of the disk fertile : of the ray sterile. 
1798. llelianthus. Recept. paleaceous, flat. Pappus 2-Ieaved. Invol. imbricated, subsquarrose. 
179.'). Gymnoloma. Invol. hemispherical, loosely imbricated. Recept. convex, paleaceous. Centnd florets 
sterile ; marginal radiant. Pappus O. 
