IIV LINN^AN ARRANGEMENT 



CLASS XIX.-i|lON(ECIA.— S/rtmms and Pistils in separate flowers on the 

 same j^lant. 



Order I.— MONANDRIA.— 1 Stamen. 



ZosTERA. Stamens and pistils separated, seated in 2 rows upon one side 

 of a flat spadix. Anthers ovate, sessile. Pistils alternating with the 

 anthers, ovate. Stigmas 2. Utricle with one seed, bursting irregularly. 

 Naiadacece, p. 385, 



Zannichellia. Sterile Fl. Perianth none. Filament slender. Fer- 

 tile Fl. Perianth cup-shaped. Pistils 2 — 4, tapering into a short style. 

 Stigma large and peltate. Fruit on a short stipe, coriaceous. NaiadoAecE. 

 p. 385. 



Cauli^jia. Perianth none. Sterile Fl. Anther nearly ses.sile. Fer- 

 tile Fl. Style filiform. Stigmas 2. Fruit capsular, l-seeded. Naiad- 

 acea, p. -385. 



Euphorbia. Rarely furnished with a perianth. Involucre 1-leaved, 

 campanulate, 4 — 5-lobed ; the lobes usually alternating with peltate glands. 

 Sterile Fl. numerous, each consisting of an anther with its filament artic- 

 ulated in the middle. Fertile Fl. solitary, central, on a long peduncle. 

 Styles 3, usually 2-cleft. Capsule 3-celled, 3-seeded. Euphorbiaccce, p. 3l*J. 



Order II.— DIANDRIA.— 2 Stamens. 



PoDosTEMUM. Calyx and corolla none. Stamens affixed to a common 

 pedicel. Stigmas 2, sessile, recurved. Capsule 2-celled, 2-valvcd, many- 

 seeded. Podostemacece, p. 114. 



(Carex, Order III. CaUitriche, CLASS MONANDRIA, Order DI- 

 GYNIA.) 



Order III.— TRIANDRIA.— 3 Stamens. 



Sparganium. Flowers in dense spherical heads, the sterile ones above. 

 Perianth single, of 3 leaves. Fruit dry. indehiscent, sessile. Typltacece, 

 p. 380. 



Carex. Sterile Fl. Stamens 3, rarely 2 or 1. Fertile Fl. Peri- 

 gynium membranaceous or somewhat coriaceous, 2-toothed, emarginate or 

 truncate at the apex. Style single, included. Stigmas 2 — 3. Achenium 

 lenticular, plano-convex or triangular, crowned with the lower portion of 

 the style. Cyperacea^ p. 403. 



Typha. Flowers collected into a long dense cylindric spike. Sterile 

 Fl. above. Stamens intermixed with simple hairs, inserted directly on the 

 axis. Fertile Fl. below the sterile on the same axis. Fruit oblong, very 

 small, stipitate. Ttjphacecs, p. 381. 



ScLERiA. Flowers glumaceous. Fertile spikelets l-flowered; the sterile 

 several-flowered. Scales 2 — 6. Disk shallow, saucer-like or lobed. Peri- 

 gynium coriaceous or crustaceous, sometimes wanting. Achenium globose 

 or ovoid. CyperacccB, p. 402. 



Tripsacum. Sterile Spikelets in pairs on each joint of the rachis, and 

 longer than the joint, collateral, 2-flowered. Flowers with 2 paleae. Fer- 

 tile Spikelets solitary, as long as the joint, 2-flowered. Flowers with 2 

 paleae ; the outer or lower flower neutral, the inner or upper one fertile. 

 Graviina/:ece, p. 452. 



CoMPTONiA. Sterile Fl. Ament cyUndric, imbricate ; scales reniform- 



