CLXXIX.  PONTEDERIACEJE. 837 
declinata, perioribus brevioribus magisque inclusis, inferioribus rarius perianthio sub- 
ioril interdum omnia sub:equalia erecta, v. unum maximum ; filamenta libera, 
filiformia v. basi dilatata v. medio incrassata. ddnfherg oblongs v. rarius ovatze, dorso 
v. basi affixce, loculis 2 parallelis distinctis rima longitudinali v. rarius poro brevi intror- 
sum dehiscentibus.  Ovariwm superum, 3-loculare placentis axilibus, v. 1l-loculare 
placentis 3 parietalibus. | Stylus filiformis v. columnaris, stigmate terminali parvo integro 
v. brevissime 3-fido, v. varie dilatato. Ovwla nune in loculis placentisve oo, 2-seriatim. 
superposita, nunc in loculo solo fertili unicum, pendula v. descendentia, anatropa.' Fructus 
Bicnum peviespie Temlranaceo i in valvas 3 medio placentiferas dehiscente, v. interdum 
Semina ovoidea v. oblonga, testa appressa in longitudinem 
oo-costata. Dien plus minus farinaceum, copiosum. |.Embryo centralis, cylindraceus, 
albumine vix v. non brevior, extremitate radiculari hilo proxima. j 
Herb aquatic, erectz v. fluitantes.  Rhizoma nunc in limo horizontale fibris radi- 
calibus tenuibus ramosis densissime confertis, nunc in caules foliatos fluitantes ad nodos 
radicantes plus minus productum. Caules floridi in rhizomate, v. rami floridi in caule 
fluitante, semper 1-foliati. Folia perfecta in rhizomate v. in caule fluitante longe petio- 
lata, lamina natante v. emersa. varie dilatata rarius angusta; folium. rami floridi radica- 
libus simile nisi brevius petiolatum ; folia sub nunc in basi tantum caulis fluitantis 
v. junioris pauca v. vix ulla, nunc secus caulem fluitantem numerosa, ad petiolos lineares 
absque lamina reducta. . Inflorescentia in caules We ramos unifoliatos terminalis, racemi- 
formis iformis rarius fasciculiformis v. iculata, in vagina folii sessilis v. 
peduneulata ; flores secus rhachin simplicem v. rarius ramosam fasciculati v. dissiti, 
sessiles v. breviter rarius longiuscule pedicellati. Spatha ad basin inflorescentiz ssepius 
complicata erecta v. apice patens, rarius a floribus distans concava patensque ; bracteze 
sub floribus minute v. 0. 
Species vix 35, in aquis duleibus regionum ealidiorum utriusque orbis imprimis Americae vigentes, 
usque ad Americam borealem, Chinam et Japoniam extensz, in Europa desunt, et in hemisphierio 
australi vix extra tropicos inveniuntur. 
Ordo quoad flores Liliaczis valde affinis, habitu tumen peculiari, inflorescentia, et presertim. 
seminibus bene distinctus, nec formis intermediis connexus. 
CONSPECTUS GENERUM. 
LB Si lo RS 
abortu Tower Lovalatmn. —Amer. "bor. «t austr. 
2. 
Stamina 6, antheris versatilibus. Ovarium 
Stamina 6, antheris versatilibus. Ovarium 
3-] lotes; multioralatun. xcu uS Afr. trop. 
La phum. Stamina 3, antheris erectis, 
onim 1-loeulare Ncimr fi 3-loculare, Itiovulatum.— Aer. bor. et austr., Afr. trop. 
ianthi tubo 0, Stamina 6, antheris erectis. Ova- 
rium bi3-ovillare, i alióvan. .— Asia, Australia, Afr. trop. 
.QL pue Linn. Gen. n. 399. (Unisema, Haf. in Journ. Phys. Ixxxix. 961.)— 
liforme, tubo i: incurvo tenui v. rarius abbreviato ; limbus erecto- 
patens, obliquus, lobis latiusculis parui libus, summo (e serie interiore) basi 
sepius maculato. Stamina 6, tubo "inequalite affixa, declinata, FUDSEIIR pepe. ino 
inclusa, inferiora e tubo exserta i thio longiora, fil 
antherw ovate, dorsifixe. Ovarium sessile, oblongum, revera 3-loculare, sed loculis 2 
minimis vacuis 1-loculare apparet ; stylus filiformis, brevis v. elongatus, stigmate termi- 
nali indiviso v. minute 3-fido ; ovulum unicum, ab apice loculi pendulum. — Fructus tubo 
janthii basi i to suleat tato v. muricato inclusus, oblongus, membranaceus, 
dehi Semen pendul testa tenui appressa ; embryo in centro albuminis fati- 
nacei cui wquilongus, eylindraceus.—Rhizoma nune in limo reptans, breve, nunc 
fluitans, eauliforme, vaginis longis foliorum obtectum. Caules (v. rami) 
erecti, Siüplicen 14 ioliati Folia radicalia e petiolata, cauli: brevius petiolat 
p 
J 
