

DIOECIA jffeNANDRIA. LXXX7ii 



CI^ASS XX. DIOECIA. 

 Order 1. Monandria. 



NAIAS. Flowers axillary and solitary. Stamen in a membranous 

 spat he ; aniher at first subsessile, the filament finally elongated. 

 Ovary tapering to a short style ; stigmas 2 to 4, subulate, fruit a 

 loosely-coated seed-like nutlet. ORD. CII. NAIADACEAE. p. 302. 



Order 2. Diandria. 



SALIX. Flowers all amentaceous ; bracts entire, 1-flowered. Calyx 

 none. Ovary 1 -celled ; stigmas 2, subsessile, 2-lobed. Fruit a 

 follicular kind of small capsule, opening at apex. Seeds numerous, 

 silky-comose. ORD. XCV. SALICACEAE. p. 276. 



[Fraxinus. ORD. LXXIV. OLEACEAE. p. 238.] 

 [Vallisneria. ORD. CIV. HYDROCHARIDACEAE. p. 306.] 



Order 3. Triandria. 



VALLISNERIA. STAM. FL. crowded on a conical receptacle, which is 

 inclosed in a 3-valved spathe, and borne on a short scape. Calyx 

 3-parted. Corolla none. PISTILL. FL. solitary, in a tubular bifid 

 spathe, on a long slender flexuose scape. Calyx-tube adherent to the 

 ovary, not extended beyond it; limb 3-lobed, with 3 small linear 

 petals alternating with the obovate lobes. Fruit long, linear, inde- 

 hiscent, fleshy and berry-like, several-seeded. ORD. CIV. HYDRO- 

 CHARIDACEAE. p. 306. 



Order 4. Tetrandria. 



VISCUM. STAM. FL. Calyx subcoriaceous, 3- or 4-parted. Corolla 

 none. PISTILL. FL. Calyx-tube adherent to the ovary ; limb 3- or 

 4-toothed, or obsolete. Petals 3 or 4, minute. Fruit a globular 

 1-seeded berry. ORD. LXXXIV. LORANTHACEAE. p. 254. 



MACLURA. STAM. FL. racemose. Calyx 4-parted. Corolla none. 

 PISTILL. FL. densely crowded, and coalesced, on a globose receptacle. 

 Sepals 4, in opposite pairs, oblong, somewhat cucullate and fleshy. 

 Ovary 1-celled ; stigmas 2, one large and feathery, the other mostly 

 abortive. Akenes embraced by the sepals, and all coalesced into a 

 large compound globose lactescent berry. ORD. XCVII. URTICA- 



CEAE.J3. 284. 



BROITSSONETIA. STAM. FL. in ament-like spikes, bracteate. Calyx 

 4-parted. Corolla none. PISTILL. FL. in dense capitate clusters, 

 mixed with hairy scales. Calyx urceolate, 3- or 4-toothed. Ovary 

 1-celled, pedicellate. Akene softly fleshy, elevated on the baccate 

 pedicel, which is surrounded at base by the calyx. ORD. XCVII. 

 URTICACEAE. p. 286. 



[Ilex opaca. ORD. LV. AQUIFOLIACEAE. p. 175.] 

 [Moms, Urtica, and Boehmeria. ORD. XCVII. URTICACEAI. p. 285-7-8.] 



Order 5. Pentandria. 



CANNABIS. STAM. FL. Calyx of 5 sepals. Corolla none. Pis- 



