582 226. COMPOSITAE 



369. Fruits winged. Receptacle convex. Involucre as long as the disc. 



Heads in lax corymbs. Leaves alternate, at least the upper ones. — 

 Species i. NaturaUzed in the tropics and in Egypt. Used medicinally. 



{Ximenesia Cass.) Verbesina L. 



Fruits not winged. Receptacle elongated. Involucre much shorter 

 than the disc. Heads solitary. Leaves opposite. — Species i. Tropical 

 and South-east Africa. Yields condiments and medicaments. 



Spilanthes L. 



370. Inner involucral bracts embracing the outer fruits. Pappus wanting. 



Herbs. Leaves opposite 37^ 



Inner involucral bracts not embracing the outer fruits 372 



371. Female marginal flowers in one row. Heads in panicles. — Species 5. 



Tropical and South Africa and Canary Islands. Some are used medicin- 

 ally Siegesbeckia L. 



Female marginal flowers in several rows, with a strap-shaped corolla. 

 Heads solitary, sessile. Marsh plants. — Species i. Central Africa. 



Enydra Lour. 



372. Receptacle-scales wholly enclosing the fruits. Pappus ring-shaped or 



wanting. Flowers all hermaphrodite with a tubular corolla or the 



marginal neuter with a strap-shaped corolla. Receptacle convex or 



conical. Herbs. — Species 2. Central Africa. Sclerocarpus Jacq. 



Receptacle-scalds partly or not enclosing the fruits 373 



373. Receptacle-scales very narrow, nearly bristle-like. Pappus wanting. 



Marginal flowers in two rows, with a strap-shaped corolla. Herbs. 

 Leaves opposite. Heads solitary or in pairs. — Species 2. They yield 



dye-stuffs, salad, and medicaments Eclipta L. 



Receptacle-scales broad or rather broad, convex or keeled 374 



374. Pappus wanting. Heads containing hermaphrodite and female flowers. 



Herbs. Leaves opposite 375 



Pappus present 37^ 



375. Inner flowers 4-merous, outer with a very shortly strap-shaped corolla- 



limb. Fruits 4-angled. Leaves oblong. Heads in groups of three. — 



Species i. Madagascar Micractis DC. 



Inner flowers 5-merous, outer with a rather long strap-shaped corolla-limb. 

 Fruits 2 — 3-angled. Leaves ovate. — Species 15. Tropical and 

 South Africa Wedelia Jacq. 



376. Pappus ring-shaped. Fruits 4-angled. Receptacle flat. Receptacle- 



scales slit. Heads in corymbs ; all flowers hermaphrodite. Shrubs. 



Leaves alternate. — Species i. Madagascar. . . Temnolepis Bak. 



Pappus cup-shaped or formed of scales and bristles. Herbs or under- 



shrubs 377 



377. Pappus of free, caducous bristles or scales 378 



Pappus of bristles united at the base, or cup-shaped with or without free 



bristles 379 



