132 



KEY TO THE FAMILIES AND GENERA 



Blade of spathc deciduous; spiithe 

 constricted in middle, leaving a long 

 Hibo "hen Ulade falls, , , ■ ; bch^malo- 



at least 



yioUis. 



Jlomalomfua. 

 Philodeniiron. 



Aglaonema. 



Dieffeubachia. 



PeUaudra. 



DD. Blade of spat he persistent, 

 until riiwning of spadix. 



E. Sewis anatropous 



EE Seeds ort hot ropou3 



cc. Plant with St. uprinht, aSrial: stamens 

 uniteii into a synandrium. 

 D. Pistillate lis. crowded, without 

 staininodia: staininatc fla. mth only 



2-3 separate stamens . ■ 



DD. Pistillate fls. with staimnodia inter- 

 spersed; staminate fla. with J^ 



united stamens 



CCC Plant »ith st. .subterranean. 



D. Seeds orthotropous or nearly ?o. the 

 connate staininodia of the pistillate 

 fl. formiuK an involucre around the 



gyna^cium .••■.■.•■•;*'■* 



DD. Seeds auatropous: staminodia of pis- , .^ 



tillatc fls. separate. ............ . • ■ ■ y^antedi>cl,ui. 



BB. U-s. netted-veined (i.e. veins of 2nd. 3rd, 

 and 4th order netted). 

 c. Milk-tubes absent. 



D. Kaphidcs absent (raphides are acicu- 



lar crystals found in bundles in the 



plant-cell). . , , 



E. Lvs. differentiated into petiole ana 



blade: seed.s anatropoua. 



F. Seeds without endosperm \ ,v .„„ 



FF. Seeds wnth endosperm ; • • Anthurmm. 



EE Lvs. without distinction into petiole 



and blade: seeds orthotropous Acorua. 



DD. Raphides present in ground tissue of 

 St. and lvs. 

 E Fls. without perianth: spathe decidu- 

 ous before ripening of spadix: 

 plants mostly climbing. 

 F. Seeds with endosperm and aiual 

 embryo, 

 o. Foliage-lv3. many on each 



shoot Stenosper- _ 



OG. Foliage-l'vs. i on each shoot in , . l"'?!i<™- 



addition to several bracts Raphidophara. 



FF. Seeds without endosperm. 



Tovary 2-ceUed Monstera. 



oq! Ova^ 1-eeUed Scmdapxu,. 



FF Fls with perianth; spathe not .. , „ 



deciduous: sub-shrubs Sputh.phyllum. 



CC. Milk-tubes present in fibro-vascular 



bundles. , , ■ t t^A 



D The milk-tubes branched; veins of 2na 



' grade fusing into a collective vein 



between veins of 1st grade. 



E. Seeds with endosperm: st. not 



F Ov"^°with basal placenta Alocasia. 



FF Ovary with parietal placenta; Colocaaia. 



FFF Ovarj- with broad, nearly central 



o.tT-all ...Caladium. 



EE. Seeds without endosperm: st. oUmb- 



Dracunculus. 



*Biarum. 



ing. 



Syngonium. 



DD. The miik^ubes simple, straight; veins 

 not as above. „ , . , 



E. Perianth present; fls. bisexual. 

 F. Lvs. not arrow-shaped. 



o Ovary 2-celled; 2 oi-ules in each 

 cell, suspended from middle of 



partition , LysichUum. 



GO. Ovary 1-celled. 1-ovuled. 



H. Ovule from apex of cell: 

 spadix short, nearly globu- 

 [^f Symplocarpua. 



HH. 0™le ba.sal: spadix cylindri- 

 cal 



FF. Lvs. arrow-shaped. _ 



o. Plants are shrubs with climb- 

 ing or creeping sts.: petioles 

 and sts. U!)ually pnckly or 



warty . 



Orontium. 



Cyrtoaperma. 



3. Spadix with rudimentary 

 fls. between the fer- 

 tile staminate and fer- 

 tile pistillate fls., or 

 staminate infl. border- 

 ing inimcdiately on the 

 pistillate infl. 

 K. Placenta parietal: lvs. 

 arrow-shaped or 



lanceolate Arum. 



KK. Placentae apical and 

 basal: lvs. pedately 

 divided. 

 L. Fertile staminate 

 infl. bordering im- 

 mediately on the 

 pistillate infl... 

 UU Fertile staminate 

 infl. separated 

 from pistillate infl. 

 by many rudi- 

 mentary fls Hehcodiceroa. 



KKK. Placenta basal. 



uLvs. pedately 

 divided: seeds 2 



or more Sauromatum. 



LL. Lvs. ovate, lanceo- 

 late or Unear: 

 seeds mostly 1 . 

 jj. Spadix without rudimen- 

 tary fls., but a space 

 between the staminate 

 and pistillate fls., or 

 unisexual. 

 K. Ovary with many 

 ovules. 

 L. Staminate fls. of 1 

 stamen: lvs. ovate 

 * or arrow-shaped: 



spadix bisexual. 

 LL. Staminate fls. of 2-5 

 stamens: lvs. 3- 

 or many-parted: 

 spadix unisexual.. 

 KK. Ovary 1-ovuled: stam- 

 inate and pistillate 

 portions of spadix 

 separated by a par- 

 tition which reaches 

 out from wall of 



spathe 



II. Appendages of the spadix 

 wing-like on the 2 sides, 

 thus dividing the bila- 

 biate spathe into 2 

 chambers, the anterior of 

 which contains a stam- 

 inate fl., the posterior a . . 



pistillate fl Ambrosmia. 



GG. Spadix without such appendage 

 or wings: sts. subterranean, 



creeping :■■• A^P*"'!''". 



Other genera described are Callopsis, Cryptocoryne, Epijprem- 

 num. Gai^olJ^e. Gymnostachys, Staurostigma, Typhomum and 

 Typiionodorum. 



204. ALISMACE.E. 



K. Carpels inserted in a whori on a smaU recep- ^ ^^.^^^ 

 A. cfr^els' densely crowded in m^ny 'aeries on a . ^ 



large oblong or globose receptacle ^- t^agMana. 



20S. BUTOMACE.E. 



Petals marcescent; stamens 9; carpels 6. . . .... 1- Bulomus. 



: Petals deciduous; stamens numerous, car- ^.^^^_.^ 

 pels 15-20 [c 



Arisarum. 



Arisiema. 



Pindlia. 



GO. Plants tuberous Dracmlium. 



EE. Perianth absent; fls. unisexual (bisex- 

 ual in Calla). , /., i, 

 F. FU. bisexual :lvs. not arrow-shaped. LaUa. 

 wr. Fls. unisexual: lvs. various. 



o .Spadix with a sterile terminal 

 appendage, or with stenle 

 wings: sts. various. 



H. Sf;cda without endosperm 



HH. Seeds with endosperm. 



I. Appendage of spadix pro- 

 jecting much beyond the 

 spathe, or included -"'' 

 free. 



206. NAIADACE.E. 



, Fls. hermaphrodite, spicate; perianth 4- ^^^^ 



divided; stamens 2or4. - 



amogelon. 

 XA. FlHnlS^aCaSla;^; perianth O; Stamens 1. 2. Zann.Mlia 



Amorphophal- 

 [lua. 



207. APONOGETONACE.ffi. 



and 



The only genus. 



Aponogeton. 



