108 CXXXV. PODOSTEMACE^. 



ft Cajisulcc valviS dh/iiicte inceqnalcs. 



16. Mnfopsis. Stigmata subsessilia, lata, brevissime multitida, fere in umim pulvinatuni 

 confei-ta. Coliimna staminea apice 3-f.da, ratno centrali aiiaiithcro. Ovarium 2-locularo. — 

 Brasilia. 



17. Sph.t:rothtlax. Stigmata sessilia, brevia, lanccolata. Alabastr.i intrn spathellam a 

 pedieello apice inflexo rcflexa. Ovarium l-locularo.— ^/r. aifsfr., Ahy.-ishiia. 



18. Castelnavia. Styli longe filiformes. Alabastra intra spatliollam sessilia crccta. Ovarium 

 1-loculare. Plantre minim^e.— F/. Araguay Brasilics. 



*** Stamen 1. 



19. OsEKTA. Filamentum ovario arete appressum, anthera extrorsum spectante, mox elastice 

 dissiliente. Plantulse nause. — Mexico, Guiana, Brasilia. 



20. Df.villea. Filamcntiim laxum, anthera introrsum spectante, Plantula nana, repens. — 

 Brasilia. 



Tribus IV. Rydrostacliydeae. Flores dioici, utriusque sesus in scapo simplici longe spicati. 

 Folia long:\, simplicia v. decomposita. 



21. Hydrostacttts. Stamen 1, anthera intra bracteam subsossilis. Ovnrinm 1-loculare, 

 plnccntis 2 parietalibus ; styli filiformes. — Madayasc, Afr, austr. or. 



GEXU8 EXCLUSUM. 



Hat.opiiti.a, Thou. (Diplaxttieba, Griff., LE^rxopsis, Zipp.) ad Naiadeas rcfcrtur. 



Tribus I. Tristiche^e. 



1. Tristicha, Than. Nov. Gen. Madag. 3. (Dufourea, Bonj in WilkL S^jec. PI. v. 55 ; 

 Philocrena, Bong. inMem. Acad. Petenb. ser. 0, i. (ve^iii. ^ars ii.), 80, t. C.)— Flores herma- 

 phiuditi. Periantliiuni tenuiter membranaceum, 3-lobiim, lobis obtusis leviter inibricatis. 

 Stamen 1, lilaiuento filiformi ; anthera erecta, basi obtusa. Ovarium ovoideum v. ellip- 

 soideum, 3-locidare ; styli 3, lincares, breves, erecti mox patentes, introrsum stigmatosi ; 

 placentre crassfe in angnlo intenio loculorum in centre ovarii counataj. Capsula ovoidea, 

 septicide 3-valvis, valvis 3-costatis ioqualibus, septis evanidis v. a placenta solutis in 

 margine valvar urn persistentibua.— Herbse bryoideje inundatfc. Caiiles breves dense 

 ofiespitosi v. elongati fluitantos fastigiato-ramosissimi. Folia parva, sessilia, confertim 

 tristicha, serieum 2 patentia, sorioi tcrtiie minora erecta. Flores ad apices ramulonmi 

 breviorum sajpius gemini ; ahibastra juniora subsessilia intra bracteas 2-3 qnam folia 

 majores ; pedunculi tamen mox accreti, fructifori longiusculi, basi bractcis stTpaii. 



Species editre 3, valde variabiles et vix limitibus certis distinct*, inter tropicos per AnmiMcam rt 

 Afrieam late diffusje. JVedd. in DC. Prod. xvii. 45 ; TViffkt, Ic. t. 1920. 



«pecic5 quarta, ex insulis Philippinis, a Preslio ex spocimine Ha^nkcano ad Tnsiicha7n relata,'ab 

 auctonbus recentioribus non visa, verisimiliter generis alicni est. 



2. Ternioia, Tul Podost. Monogr. 189, t 13. (Latvia, Tul in Ann. Sc. Kat. ser 3 xi 

 112. Dalzellia, Wight, Ic. v. 34, t. 1919, 1920 (Tulasnea in ic). Mnianthus, Walp 

 Arm. HI. 443.)— Flores hermaphroditi. Perianthium tenuiter membranaccum 3-lobum 

 lobis obtusis erectis leviter imbricatis. Stamina 3, filamentis filiformibus liberis • 

 antherre erectas, basi emarginatre v. sagittatie. Ovarium ovoideum v. ellipsoideum 3- 

 loculare ; styli 3, breviter lineares, mox patentes, introrsum stigmatosi ; placentae crass.-e 

 in angulo mtemo loculorum in centro ovarii connat^e. Capsula ovoidea, septicide 

 3-valvis, valvia 3-costati.s requalibus, septis evanidis v. a placenta solutis in marrrine 

 valvarum pcrsistentibus.-Caules adnati tlialliformes margine lobati, v. (in T. ramodssima, 

 Wedd.) elongati fluitantcs. Folia minima, setacea, in gemmis florifcris fasciculata in 

 ramis elongatis sparsa. Gemm^ floriferce in caulLs basi adnata v. secns ramos elongatos 



T^r' ^ Tl^" r .-'T ^'''']!''''^'''^^ ^^^i^^-^^^ «'M>ius plus minus in vaginam connatonuu 

 fitipati, spathclla distmcta nulla. 



Hpecios 7. India^ Oriontalis Peninsuk' et ZeyUmi* incola^. }Vcdd. iv DC. Trod. xvil. 40. 



