Richardsonia.| COMPOSITAE. 189 
13. RICHARDSONIA, Kunth. 
Calyx-limb 4—8-lobed, persistent. Corolla funnel-shaped, 3—5-cleft, with 
valvate lobes. Stamens 3—5, inserted in the throat of the corolla, with 
slender filaments, the anthers linear-oblong, affixed near their bases, ex- 
serted. Style filiform, with 3—4 exserted linear or agora branches, 
vary 3—4-celled. Ovules 1 in each cell, affixed to the mi of the 
septum or lower. Fruit dry, papillose or prickly, ae er -coecous, ia cocci 
breaking asunder after the ipeulas rupture of the calyx below the limb, 
indehiscent, with 2 furrows on the inner side. Seed peltate. Embryo 
axile in horny albumen, with foliaceous cotyledons, re nadicia terete, 
— Perennial, hispid herbs, with terete stems. Leaves opposite, 
becca Stipules connate into a sheath with many bristles. Flowers small, 
collected in terminal heads, involucrate by the 2 uppermost leaf pairs. 
A genus of 5 to 6 species, natives of tropical America. 
+1. R. scabra, L. (sub Richardia). — DC. Prod. IV, 567. — A small 
gates aeP ldap hirsute stems. Leaves subsessile, ovate to lanceolate, 
to 1'/ 1'3—1/2‘, acuminate, rough at the margins and underneath along 
the nerves with ied stiff hairlets. Stipular bristles 3 to 4 on a side, 
as long as their sheath. Heads many-flowered. Calyx in fruit 23/2", 
stiff hairy, its limb as long as the tube, constricted at the base, vn 
5—6 ovate lobes. Corolla twice as long as the calyx-lobes, pubescen 
white, 5—6-lobed. Fruit muricate, splitting into 3—4 obovate ati 
cocci or carpids. Embryo straight, almost as long as the album 
St. — Pl. Us. tab. 8. — Griseb. Fl. W. Ind. p. 351. 
Kauai! on pasture lands between saa and Nawiliwili, and in Waimea. A native 
of 8, ppm and the W. Indies 
Orper XLII. COMPOSITAE. 
Flowers or florets collected together into a head surroun unded by an 
involucre of several ‘Braces, either in one row or imbricate in several 
or hairs or bristles (paleae) between the florets. In each floret the calyx 
is wanting or gsi by a pappus or ring of hairs or scales on the 
ry. Florets wither’ all hermaphrodite, with corolla ligular 
— # ese or tubular, and 5-, rarely 4-toothed (heads discoid); or 
those of the center or disk hermaphrodite or male and tubular, an 
those of the same aie: female, either ligular (in Remya bi abiate), 
forming a ray (heads radiate), or tubular and filiform. In Xanthium 
and Franseria flower-heads monoecious, male and female flowers in 
distinct heads. Stamens 5, inserted in the tube of the corolla, the an- 
linear and united into a sheath round the style (except.in Xanthium and 
Franseria), often sagittate at the base, the basal lobes sometimes prolonged 
