ISOTACHIS. 339 
solitariam in Andibus Quitensibus inveni. J. (Sendtnerella) ripensis n. sp. 
perianthium habet latum, tota fere longitudine obtuse 5-carinatum, ore 
profunde 10-fidum, laciniis lanceolatis denticulatis ; folia foliolaque, idem 
ac in nonnullis Herbertis, bast spinosa. J. (Sendtnerella) erythrorhiza L. 
et L. medium fere tenet inter Jsotachin et Sendtnerellam, perianthio inferne 
3-2-cell. crasso, epapilloso autem, dimidio supero obtuse 3-4-plicato; foliolis 
medio margine utrinque grandidentatis, quasi 4-lobulatis. Cum Isotacht 
congruit capsula torta, duin capsula J. ripensis ignota adhue remanet. 
Herberta Gray (= Sendtnera Nees.) Sendtnerelle habitu et foliis tristichis 
subsimilis, pro m. longe robustior est, colore badio; foliis prelongis 
uncinatis, profunde bifidis, cellulis medianis linearibus vittatis ; peri- 
anthiis alte trigonis (carinis latis unisulcis) apice longe subulatis; capsule 
valvulis rectis bi-plurilobis.—Pleuroclada nob. et Anthelia Dum. genera 
Isotachi e longinquo affinia sunt. 
IsoTACHIS (SENDTNERELLA) RIPENSIS, Spruce. 
Hab. Andes Quitenses, ad rivulorum ripas montis Pzchincha. 
F165x*1:15; c 3-353; f@ 1:15x0°9; per 2.5™™, 
Czespitosa tenera e pallide viridi rufescens. Caudex brevis tenuis pro- 
stratus repensve ramosus, foliis rudimentariis et radicellis vestitus, 
flagella postica radicantia et caules assurgenti-erectos proferens. 
Caules steriles elongati, feminei breves, 4—-3-pollicis longi, infra 
perianthium terminale innovationes $—1-pollicares solitarias binasve 
laterales proferentes, ceeterum vel simplices vel ipsa basi subramosi ; 
ramis foliosis lateralibus, flagellaribus (paucis) posticis microphyllis 
radicelliferis ; praeterea arhizi. 
Folia caulina arete imbricata, imnovationum dissitiuscula, subincuba 
(linea transversali, vel antice subincurrente, cauli inserta) devexo- 
secunda, complicato-concava, basi turgida, ineequilateri-cordato- 
ovata, ad } usque bi- (raro tri-) fida ; lobis subeequalibus sinubusque 
acutis, raro obtusis; basi antica integerrima, postica 1-3-spina; 
cellule mediocres subconformes, oblongo-quadratove-hexagone con- 
vexule leptodermes, nisi ad angulos leniter incrassatee, endochromio 
parco pro parte in annulum tenuem opacum congesto. 
Foliola paulo breviora, transversa, fere squarroso-recurva, oblonga bifida, 
basi utrinque 1—3-spina. 
Flores dioici: Q terminales, innovatione suffulti. Bracteze 1-juge, foliis 
submajores, ad 4 bi-trifidee, plerumque serrulate, cum bracteola 
conformi szepissime altiuscule connate. Pistillidia sub 16. 
Perianthia (juniora) subemersa, ovoidea, obtuse 5-plicata, tenuia unistrata 
leevissima, ore constricto profunde 10-fida, laciniis longe lanceolatis 
7-10-denticulatis, e margine recurvo canaliculatis.* 
Obs. The innovations uniformly spring from the axils of the side leaves 
next below the bracts; but the rooting flagella are axillary to the under- 
leaves. The perianths consist of but one layer of cells, and there are no 
adnate scales or bracteoles on any part of them. 
* Forsan ad Sendtnerellam pertineat quoque Sendtnera? trifida Gottsch. 
Hep. Novo-Granat., sterilis solum adhue nota, cui adsunt folia omnia trifida, 
margine postico 3-pluridentato; foliola triplo minora trifida, utrinque pluri- 
dentata. 
