2. ROSTKOVIA, Desv.
Flos majusculus, solitarius. Perianthium glumaceum, hexaphyllum ; foliolis lineari-subulatis, 3 exterioribus paulo majoribus, dorso acutis. Stamina 6, imo perianthii inserta, foliolis opposita ; antherm apice unguiculatae. Ovarium oblongum, elongatum v. ovatum, trigonura, uniloculare. Ovula plurima, biserialia, placentis 3 parietalibus adnexa, anatropa. Stylus validus, elongatus, apice incrassatus. Stigmata 3, exserta, maxima, lineari-subulata, intus glandulosa, dorso profunde canaliculars. Capsula unilocularis, trivalvis, valvis medio intus carinatis, carinis e septis retractis formatis. Semina plurima, horizontalia v. ascendentia. Testa, varia. Embryo minimus, subquadratus, in basi albuminis carnosi inclusus. — Herbae Antarctica. Culmi basi vaginati. Folia solitaria v. plurima, elongata, teretia. Scapi graciles, apice uniflori, foliis breviores. — Character ex Desvaux, paucis mutatis. — Rostkovia et Marsippospermum, Desv.
1. Rostkovia Magellanica ; culmis casspitosis simplicibus v. ima basi divisis, foliis plurimis strictis erectis basi vaginantibus longe lineari-subulatis semiteretibus infra medium canaliculatis, seapis foliis longioribus, floribus bractea elongata subtensis, perianthii foliolis ovato-lanceolatis marginibus late scarioso-membranaceis, capsula perianthio paulo longiore, seminum testa albumine conformi coriacea. — Rostkovia sphaerocarpa, Desvaux, Journ. de Bot. vol. i. p. 327. Juncus Magellanicus, Lamk. Encycl. Method, iii. p. 266. Gaud, in Ann. Sc. Nat. vol. v. p. 100, et in Freyc. Voy. Bot. p. 132. D'Urv. Fl. Ins. Mai. in Ann. Soc. Linn. Paris, vol. iv. p. 604. Kunth, En. Plant, vol. iii. p. 357-
Hab. Campbell's Island ; in mossy and springy places on the hills, especially at the sources of streams.
Culmi basi compressi, subelongati, inclinati, fibras crassas emittentes, interdum subsurculosi, simplices vel divisi, rarius parce ramosi. Folia plurima, ad basin scapi cujusvis 8-10, erecta, stricta, rigida, longissime lineari-subulata, 5-10 unc. longa, basi longe vaginantia, semiteretia v. obscure trigona, intus solida, supra basi ad medium canaliculars, superne subtriquetra, ad apices pungentia, plus minusve curvata, glaberrima, polita, nitida : vagina? compressse, - 1 unc. longse, basi 3-4 lin. lata, subchartacea?, superne coriacea?, oblique truncate. Scapi solitarii v. rarissime duo, erecti, graciles, teretes v. subtrigoni, foliis ^—^ breviores, infra florem solitarium subincrassati, rigidi, solidi. Bractea ad basin floris 2, valde inaequales ; superior e basi ovato-lanceolata subulata, concava, chartacea, perianthium vix superans ; inferior concava, e basi vaginante late ovata, longe subulata, erecta, stricta, perianthium bis quaterve superans, interdum folium omnino simulans. Perianthium unc. longum ; foliola lineari-oblonga, attenuata, acuta v. acuminata, inter se subsequalia ; exteriora paulo majora, concava, dorso acuta, superne carinata, coriacea, striata, castanea, nitida, marginibus late scariosis, pallidis ; interiora planiora, medio incrassata. Stamina 6, inclusa ; filamenta linearia, medio uninervia, perianthio £ breviora ; anthera lineares, elongate, filamentis paulo breviores ; connectivo ultra apicem in unguem brevern, obtusum, subrecurvum producto ; loculis parallelis, rimis lateralibus dehiscentibus. Pollen tetragonum, intus 3-4- granulosum, flavum. Ovarium elliptico-ovatum, in stylum attenuatum, obtuse trigonum, 1-loculare. Placenta nerviformes, parietales, dissepimentis obsoletis site. Ovula plurima, biserialia, ascendentia, funiculis brevibus placentis adnexa, anatropa. Stylus elongatus, erectus, validus, strictus, basi gracilis, superne gradatim incrassatus, ovario aequilongus. Stigmata 3, tota exserta, erecto-patentia, subulato-filiformia, ad baseos latiores confluentia, intus per totam longitudinem glandulosa, dorso glaberrima, profunde canaliculata. Capsula perianthium superans, late obovato-oblonga, prismatica, angulis obtusiusculis, apice acuta, v. stylo persistente mucronata, dura et coriacea, sublignea, castanea, nitida, quasi vernicosa, unilocularis, polysperma, trivalvis ; valvce oblonga?, utrinque acuta?, concava?, dorso medio canaliculate, intus septo incompleto costatre. Semina numerosa, conferta, lentiformia, utrinque obtusa, paulo compressa, latere unico subcarinata, hevia, castanea, nitida, basi pallidiora ; umbilico nudo. Membrana seminis exterior crassa, coriacea, intus spongiosa ; interior membranacea, obscure reticulata,
