106 CXXXV. PODOSTEMACE^. 



minug connatis v. stamen revera -unicum ad muim latus ovarii, v. in fiore ^J stamen 



nnicum subsessile. " Anthcr(^ ovatjeoblongre v. breviter lineares, loculis 2 parallelis con- 



tiguis longitudinaliter deliiscentibnSj ad basin connectivi angnstissimi locnlis brevioris v. 



siibseqiiilongi afJixa3. Ovai-^ium sessile v. breviter stipitatum, liberum. 2-3-loculare, septia 



tenuissimis diviaum v. septis jam ante anthesin evanidis v. abortivis l-loculare v. in llore 



2 ab initio 1-locnlare. Styli 2 v. 3, breves v. brcvissimi, distincti v. basi brevissime 



connati, lincari-tereteSj summo vortice v. superne v. fere a basi introrsum stigmatosi, v. 



ad stigmata lanceolata ovata varie dilatata v. brevissime pulviniformia reducti. Ovula cc 



stepius numerossima, in placenta centrali crassiiiscula septo utrinque adnata v. in flore 



2 in placcntis 2 parietalibus sessiliaj irregulariter oc-seriataj anatropa. Capsnla sub- 



globoaa ovoidea ellipsoidea v. oblonga, in gcncribus licrmaphroditis 2-3-locularis v. septo 



abortivo 1-locularis, costis go longitudinalibus siepius prominulis rarius obscuris instructa, 



valvis 2 sequalibus v. inrequalibus v. 3 ?eqnalibus septicide dehiscens, placenta centrali 



seminifera et in capsnlis inrcqualibus cum valva minore per dehlscentiam deciduis, valvis 



feqiialilius v. in capsula inrequali valva majorc diu in pedicelhim persistentibus ; in genero 



dioico capsula 1-locularis, introrsum rima longitudinali foUiculatim dehiscens. Scniina 



numerosa, minima, sessilia, vulgo ellipsoideo-compressa, sub lento rugulosa, testae cellulis 



crassis aquse ope mire tumefactis hyalinisque. Alhitmen 0, Embryo semini conforraisj 



rectus, srcpius ad medium in cotyledones 2 divisus, radicula hilum versus obtusissima. 



Herbce aquaticee immersse, frequentissime annure, sed baud raro percnnantes inter- 

 dumque plane perennes, s^pe pusillissinioe, liumiliores e parenchymate quasi omnino con- 

 fect?e, nobiliores fibris ligneis vasisque annularibus et propriis etiam donatse. Caulis basi 

 V. interdnra ex toto (rliizoma a nonnullis dictus) explanatus v. crassus, super saxa repens 

 et tenacissimo adha^rens v. adnatus, margine varie lobatus v. in ramos liberos dichotomos 

 V. varie divisos desinens. Folia lieteromorpha, modo parva squamiformia v. folia mus- 

 corum frondosorum simulantia secus caules elongates v. ad basin pedunculorum disticha 

 v. tristichaj modo majora (in una specie 2-3-pedalia) varie expansa lobata v. lacera v. 

 angiistissima et repetiter divisa frondes algarum v. interdum Trichoniam's species 3-pin- 

 natas simulantia, in caulis basin v. secus ramos varie disposita, interdum cum lobis v. 

 ramis caulis continua ; hrec folia frondiformia in aqua fluitantia S£epe tenerriraa facile 

 deliquescontia et jam sub antliesi v. ante maturitateui fructus evanida, ita ut specimina sicca 

 spocierum revera foliatarum baud raro omnino aphylla videantur. Florea nunc in super- 

 ficie caulis adnati v. explanati sigillatim sparsi v. faaciculati, nunc ad mai'gines v, secus 

 rajnos caulis varie sparsi v. in spicam v. raccmum simpliccm v. ramosum diapositi, in axilla 

 bracteae concava3 sessiles v. breviter peduuculati, alabantro intra bracteam utriculiformcni 

 oblongam v. elongatam porfocte incluso ; i)er anthesin pedicellus sjepius elongatur et 

 longe exseritur, bractea apice disrupta v. oblique fissa prope basin pedicelli persistente 

 cupulata V. tubulosa et spathella dicta. 



Species ad 120, scopulis immersis affix^e, in undis rapide fluentibus rivulonim amniumque tropi- 

 calinm Americjc, Africijeet Asi«, perpaiic?e extratropicales in America borenli et Africa aiistrali, una 

 sola adhuc impei-fecte nota in Australia (in flur. Johnstone regionis tropic?e orirntalis a W. Hill 

 detecta), et altera valde dubia ex Kuropa (apud Insubres) provenire dicitur. 



In hoc ordine elaborando fere in omnibus seeuti sumus monographifim cximiam Tulasnoi, cum 

 additamentis po.sterioribus Weddellii, cnjus observatioucs accuratis&imas in spcciminibns pcrphu-imis 

 licrbarii Ke-^'cnsis confirmaro potuimus. Paullulum tantum ab illo dissentimus do interpretatione 

 liomologa squamellarum ad busin filameutoruni iisque alternarum, in floribus sic dictis perianthio 

 destitutis observutanim. Ex WeddeJlio staminodja sunt, nobis potiiis perianthiisegnientorum rudi- 

 luenta videntur. Situm occupant perianthii }Ve(Idellint7>, scm-per staminiljus plus minus externa sunt, 

 et ubi longiuscula lineariafjuo ovadent nunquam nidimonta anthorarum ostendunt. Do situ partis 

 stigmatosre stylorum non semper certi sumits, nam styli in si:)eciminibus siccis jam post fcceuuJa- 

 tioncm sfcpis.sime plus minus desiccati sunt. AfEnitatcs ordinis adhuc omnino dubiaj remanent. 



CO^''SPEC?TUS GE:XEliUK. 



Tribus I. Tristfchese. Flores hermaphroditi. Perianthfum tubulosum v. campanulatum, 



