CLASS XIX. ORDER XIL 



03 



florets many, in an imbricate head ; partial 

 perianth superior, 2 or 3-sepalled. Stamin- 

 ate Howers ccnti;il, with monopetaloiis-clelt 

 corollas. Pistillate iiowers marc^inal, with 

 S-petalled corollas ; stigmas 2 or 3 ; capsule 



2 or 3-celled, 2 or 3-lobed ; pericarp 1-seed- 

 ed, crowned with the corolla, (pipe-wort.) 



Xan"thium. Monoecious. Staminate 

 flowers : involucrum imbricate ; anthers ap- 

 proximate, but not united ; receptacle chaf- 

 fy. Pistillate flowers: involucrum 2-leaved, 

 1-flowered ; corolla none ; drape muricate, 

 2-cleft ; nut 2-celled. (sea-burdock.) 



Ur^'tica. Staminate flowers: calyx 4- 

 leaved ; corolla ; nectaiy central, cyathi- 

 form. Pistillate flowers : calyx 2-lcaved, 2- 

 valved ; corolla ; seed 1, glo.s.'jy. (nettle.) 



Mo'rus. Staminate flowers : calj'x 4- 

 parted ; corolla 0. Pistillate flowers : calyx 

 4-leaved; corolla ; stj-les 2, calyx becom- 

 ing beny-like ; seed 1. (mulbeny.) S. 



Bux^us. Staminate flowers : calyx 3- 

 leaved ; petals 2. Pistillate flowers : calyx 

 4-leaved ; petals 3 ; styles 3. (box.) Ex. 



Amaran'^thus. Staminate flowers: ca- 

 lyx 3 or .'j-leaved ; corolla ; stamens 3 or 

 5. Pistillate flowers : calyx and corolla as 

 the staminate ; styles 3 ; capsule 1-celled, 

 opening transversely; seed 1. (amaranth, 

 red cock.scomb.) 



Ambro'sia. Staminate flowers : common 

 calyx 1 -leafed; anthers in contact, but not 

 united ; corolla 1-petalled, 5-cleft, funnel- 

 form ; receptacle naked. Pistillate flowers: 

 calyx 1 -leafed, entire, or 5-toothed, 1 -flow- 

 ered ; corolla ; nut covered with the indu- 

 rated calyx, 1 -seeded, (hog-weed.) 



Pachysan'''dra. Calyx about 4-.sepalled ; 

 corolla none ; filaments sub-clavate ; styles 



3 ; capsules 3horned, 3-celled ; cells 2-seed- 

 ed. 



Schizan"dra. Calyx 9-sepalled ; sepals 

 in 3 series ; corolla ; anthers sub-sessile, 

 cohering at the tips ; hemes 1-seeded, in- 

 serted on an elongated receptacle. S. 



Parieta'ria. Polygamous. Perfectflow- 

 ers : calyx 4 -cleft, inferior ; corolla none ; 

 stamens elastic ; style 1 ; seed 1. Pistillate 

 flowers : calyx 2-sepalled ; uut covered 

 with the dry elongated calyx, (pellitory.) 



order VI. hexandria. 



Ziza'nia. Staminate and pistillate flow- 

 ers mixed. Staminate flowers : calyx ; 

 corolla-glume 2-valved, awned. Pistillate 

 flowers : glume 2-valved, hooded, awned ; 

 style 2-parted ; seed inverted in the plaited, 

 glume-like corolla, (wild-i-ice.) 



Hydrochlo'a. Pistillate flowers: glumes 

 none ; paleaa awnless. Staminate flowers : 

 glumes none ; paleas 2, awnless ; stigmas 

 9, very long ; seed 1, reniform. 



Co'cos. See specific description. 



ORDER Xir. POLYANDRIA. 



A. Stems not icoody. 



Sagitta'ria. Staminate flowers : calyx 

 l-leaved ; corolla 3-petalled ; filaments most- 

 i<jl 24. Pistillate flowers : calyx and corolla 

 •t '« the staminate ; germs many ; 'capsules 



aggregate, 1-seeded, not opening, (arrow- 

 head.) 



Ceratophyi/'lum. Staminate flowers 

 calyx many-parted ; corolla none ; stamens 

 16-20 ; anthers tricuspidate. Pistillate flow- 

 ers : corolla none ; style 1, filifonn ; nut 1- 

 seeded. (horn-wort.) 



My'riophyl'^luji. Flowers monoecious, 

 or rarely perfect. Staminate florets : calyx 

 4-parted ; petals 4-lobed, alternating with 

 the calyx, ovate, caducous ; stamens 4-6, or 

 8. Pistillate flowers • calyx adhering to the 

 ovaiy ; limb 4-lobed ; petals none ; nats 4, 

 compressed or sub-globo.se, 1-seeded. (wa- 

 ter milfoil.) 



A'rum. Spatha cucullate, 1-leafed ; spa- 

 dix not entirely covered with the fi-nctifica- 

 tion, being more or less naked above, with 

 pistillate flowers beneath, and staminate in 

 the middle (sometimes a few are staminate 

 beneath ; berry mostly 1-seeded, generally 

 ciiTOse-glandular beneath). (Indian, or wild 

 tuniip, wakerobin.) 



Rensselae'ria. Spatha convolute ; spa- 

 dix covered w^ith flowers, fertile at base, 

 stei-ile above ; perianth ; beny 1-seeded. 

 (spear ai'um.) * 



Cal'^la. Spatha ovate, becoming ex- 

 panded ; spadix covered with the fnictifi- 

 cation ; stamens intei-mixed. Staminate 

 flowers : calyx and corolla ; anthers ses- 

 sile. Pistillate flowers : calyx and corolla 

 ; berries 1-celled, many-seeded, crow^ned 

 with the short style, (water-ai-um.) 



Pote'rium. Staminate flowers : calyx 4- 

 leaved ; corolla 4-pai-ted ; stamens 30 to 50, 

 Pistillate flowers : calyx and corolla hke 

 the staminate ; pistils 2 ; beny from the in- 

 durated tube of the corolla, (bumet.) 



B. Stems icooiy. 



Q.uer"cus. Staminate flowers: anient 

 loose ; calyx sub 5-cleft ; corolla ; stamens 

 5 to 10. Pistillate flowers : calyx 1-leafed, 

 entire, scabrous, being a woody cup ; style 

 1 ; stigmas 2 to 5 ; nut or acorn 1-celled, 1- 

 seeded, coriaceous, surrounded at the base 

 by the permanent calyx, (oak.) 



Cory'lus, Staminate flowers : anient 

 cylindric, imbricate ; calyx a 3-cleft scale ; 

 pericarp none ; stamens about 8. Pistillate 

 flowers : calyx 2-parted, laciniate ; stigmas 

 2 ; nut ovate, suiTounded by and included in 

 the permanent leaf-lil^e calyx, (hazle-nut.) 



Fa'gus. Staminate flowers : ament round- 

 ish ; calyx 5 or 6-cleft, beU-fonn ; stamens 5 

 to 12. Pistillate flowers : calyx 5-toothed, 

 setose ; germs 2 ; nuts 2, enclosed in tlic ca- 

 lyx, becoming coriaceous, echinate. (beech.) 



Casta'nea. Polygamous. Staminate 

 flowers : ament naked, linear ; corolla 

 or calyx 1-leafcd, 5 or 6-parted ; stamens 10 

 to 20. Pistillate flowers : calyx 5 or 6- 

 leaved, or 5 or 6-lobed, muricate ; germs 3 ; 

 nuts 3, with coriaceous putamen enclosed in 

 the calyx, becoming echinate. (clie.itnut.'i 



Bk'tui.a. Stamiiinte flowers: ament cyl- 

 indric, imbricate ; scales peltate, 3-flowered , 

 stamens 10 to 12. Pistillate flowers: calj-x 

 a 2 or 3-flowercd scale ; seed 1, winged, 

 (bircb.) 



