CLXXIX. PONTÉDERI ACE. 839 
incrassatis, uno ssepius cseteris longiore minusque incrassato, rarius omnibus sub:zqua- 
libus ; antherz ovatce v. oblongz, una ssepius majore v. heteromorpha, erect:e, basifixz, 
loculis introrsum dehiscentibus. Ovarium 1-loculare, placentis 3 parietalibus parum 
prominulis v. plus minus intrusis, ovarium imperfecte vix perfecte in loculos 3 dividen- 
tibus; stylus filiformis, stigmate parvo v. oblique incrassato dentatoque; ovula in 
quaque placenta co, 2-seriata. Capsula oblonga v. linearis, perianthio emarcido tenui 
inclusa, membranacea, in valvas 3 medio placentiferas dehiscens. Semina parva, ovoidea, 
26-costata.—Rhizoma nune in limo breve, mne, sepius in caulem foliatum submersum 
brevem v. el 1 fluitant d Folia nune omnia submersa linearia 
absque lamina, 1 nune omnia v. pleraque longe petiolata, lamina ovata cordata v. reniformi 
natante v. emersa. Caules v. rami floriferi more ordinis 1l-foliati, in speciebus lineari- 
foliis tamen brevissimi, folio ad axillam folii caulinis sessili eique simili. Spatha angusta, 
nunc flores 1-3 includens, nunc spicam interrupte co-florem exserens. Flores c:xrulei 
albidi v. pallide flavescentes, quam in ecwteris generibus s:zpius minores tenuioresque. 
Species nobis adsunt 8, quarum una Afric tropicze incola, ezetere omnes Americans, boreales 
v.australes. Kwunth, Enwm. Pl. iv. 119.  Seub. in Mart. Fl. Bras. iii. 1. 87. Torr. Fl. N. Vork, 
t. 192. Bot. Mag. t. 6192. 
Species plereque, foliis lamina natante v. emersa preditis, habitu EichAornie naíanti accedunt, 
inter illas tamen A. spicata, Presl, Symb. t. 10, a qua H. peduncularis, Benth., vix differt, insignis 
est floribus in spica elongata secus rhachin dissitis; stamina minus inzqualia quam in speciebus 
typieis. Species 3, foliis omnibus submersis linearibus absque lamina, inter se pluribus notis 
differunt. In EH. graminea, Vahl (Torr. Fl. N. York, t. 133, Hook. Exot. Fl. t. 94. ScmorLxkna, 
Sehreb. Gen. Pl. 785, charactere valde manco, genus ad hane speciem limitatum a Willd. in 
Gesellseh. Nat. Fr, Berl. N. Schrift. iii. 438, et, serius ab A. Grayio acceptum), spatha tenuis 
sepius l-flora, perianthii tubus valde elongatus, et stamina omnia squalia, v. unum vix ezeteris 
majus. In Z.zosterefolia, Mart. Nov. Gen. et Sp. i. t. 3, habitus, folia et infloreseentia omnino 
H. graminee, spatha 1- rarius 2-3-flora, sed perianthii tubus minus elongatus, et stamen unum 
exteris multo majus. In H. Seubertiana, Solms-Laub. in herb. Kew. (Eichhornia. graminea, Seub.), 
caulis foliatus brevior, foliis tan en omnibus linearibus submersis, spiea elongata floribus dissitis 
H. spicate, et. stamen unum eseteris conspieue majus. 
4. Monochoria, Presl, Hel. Honk. i. 127. —Perianthi lat tubo 0; seg- 
menta distincta, subsqualia. Stamina 6, basi segmentorum affixa. v. fere hypogyna, 
perianthio breviora, filamentis basi hyalido:dilatatis, omnia zequalia v. ssepius unum majus, 
filamento margine uno latere dente mr antherm o plcna erebteo, basifixze, loculis poro 
ierminali mox in rimam longitudi Ovarium sessile, 
ovoideum, 3-loculare ; stylus filiformis, àtiginate parum üilstato minute 3-lobo ; ovula in 
loculis numerosa... Capsula oblonga, Semina 
ovoidea, utrinque obtusa, oc-costata ; embryo i in centro albuminis farinacei eo vix brevior, 
cylindraceus.—Rhizoma in limo breve, rarius in caulem sub breviter product 
Caules seu rami florentes 1-foliati, cum foliis radicalibus in rhizomate caspitosi, Nolis 
radicalia longa, caulinum brevius, petiolata, lamina sagittata rdat ia v. 1 
Racemus nune intra vaginam folii caulini sessilis, b imus, floribus is longi- 
uscule pedicellati liformis, nune longior, laxiusculus v. Lfére spiciformis, pedicellis 
brevissimis. Spatha complicata, ad basin racemi v. intra vaginam ad basin pedunculi. 
Species ad 6, Indie orientalis, Ching, Japoniz, Archipelagi Malayani, Australiz et Afrieze tropiez 
incole. Kwnth, Enum. Pl. iv. 182. Benth. FI. Austral. vii. 72. Reg. FI. Ussur. t.12..— Roxb- 
Coroi. Pl. t. 1310, 111. Syiies, Emb. Ava, t. 23. Andr. Bot. Rep. t. 490 (ic. plures sub Ponte deria). 
Liwwosracuys, P. Muell. Fragm. Phytogr. Austral. i. 24, est. M. cyanca, F. Muell. species Aus- 
traliana, sta minibus zequalibus v. uno parum tantum majore. 
