56 Fr. Buchenau. — Alismataceae. 



L. var. simplex Hook. Fl. bor.-amer. II. (4 840) 167. — S, graminea Michx. et S. Pur- 

 shii Kunth, Enum. pl. III. (1 841 ) 160. — S. stolonifera Engelm. et Gray, PI. Lind- 

 heimerianae in Bost. Journ. Nat. Hist. V. (1845) 2 34 (v. Buchenau in Abh. Nat. Ver. 

 Brem. II. (1868) 30); Micheli in DC. Monogr. Phaner. III. (1881) 70; Smith in Rep. 

 Miss. Bot. Garden VI. (1894) 24, t. 19, 20, 21; Britt. and Brown, 111. Fl. North. Un. 

 States I. (1896) 91. — PI. gracilis, stolonifera et tuberifera. Caules graciles, teretes, 

 folia subaequantes vel superantes. Folia longe petiolata; lamina tenuis, linearis, lanceo- 

 lata, vel elliptica, plerumque utrinque attenuata, raro basi obtusa, rarissime auriculata. 

 Inflorescentia gracilis, fere semper simplex i. e. racemosa, verticillis 2 usque 7, basi- 

 laribus 1, 2 (raro 3) fertilibus; bracteae ovatae, acutae, inferne coalitae; pedunculi 

 aequales, graciles, divaricati, ca. 2 (1 usque 3) cm longi; flores mediocres; sepala 

 3 — 4 mm longa; petala obovata, ampliora; stamina 15 usque 20; filamenta dilatata, 

 pubescentia; antherae oblongae, filamenta aequantes. Fructus diam. 5 usque 10 mm 

 (magnitudine pisi minoris); fructiculi parvi, ca. 1,5 mm longi, complanati, alati, recti, 

 obovato-cuneati, lateraliter breviter rostrati, lateribus indistincte marginatis, glandulosis. 



In Nord-Amerika weit verbreitet, von New-Foundland bis zum Missouri und 

 südwärts bis Florida und Texas. 



Nota. Species in forma typica valde cliaracteristiea, facile distinguenda gracilitate omnium 

 partium, foliis teneris (perfectis ellipticis, vix unquam auriculatis) , nervis a basi discreüs. Folia 

 submersa linearia, tenerrima. 



Var. eycloptera (Mohr) Smith 1. c. 26, t. 20. — S. cycloptera Mohr in Bull. Torr. 

 Bot. Club XXIV. (1897) 20. — Gracilis, 2 usque 8 dm alta (»from a horizontal or oblique 

 rhizome« Smith — ? Fr. B.) Folia phyllodina sive lineari-lanceolata, basi et apice sensim 

 attenuata. Inflorescentia racemosa vel subpanniculata , internodia pedunculis longiora. 

 Fructiculi 1,5 mm longi, »with an abrupt dorsal crest, an arched wing and a median 

 vertical resin passage on each side or when maturing under water only costate or 

 wrinkled « . (Smith) . 



Von Süd-Carolina bis Florida und Louisiana. 



Var. Chapmani (Mohr) Smith 1. c. 2 6, t. 21. — S. Chapmani Mohr 1. c. — Caules 

 graciles, 2 usque 5 dm alti. Folia submersa lanceolata, 10 usque 30 cm longa, emersa 

 longe petiolata ; lamina anguste-lanceolata, acuta, 2 usque 3 cm lata, 1 5 usque 2 cm 

 longa. Inflorescentia gracilis, multiflora, simplex vel raro panniculata. Fructus diam. 

 5 mm; fructiculi 1 mm longi, fere mutici, dorso breviter, lateribus vix alati. 



Florida und Alabama. 



Species imperfecte cognita, semel collecta. 



S. macrocarpa Smith in Rep. Miss. Bot. Garden VI. (1894) 27, t. 23. — Valde 

 al'finis S. gramineae var. eyclopterae et var. Chapmani, differt tantum pedunculis brevi- 

 oribus, fructibus majoribus, diam. ca. 12 mm; fructiculi »oblong obovate, 3 mm long, 

 broadly winged on both margins, smooth or faintly unicostate and with 2 or 3 resin 

 passages on each side, beak short and oblique«. — South-Carolina; M. A. Curtis (hb. 

 Engelm.) — PI. melius inquirenda. 



Species dubia, S. gramineae affinis. 



S. Mohrii Smith in Mohr, Notes Alabama Flora, in Bull. Torr. Bot. Club XXIV. 

 U 897) 19, t. 290. — Planta dubia in suburbe civitatis Mobile, Alabama et in Georgia, 

 observata, S. lancifoliae vel S. gramineae (var. eyclopterae vel Chapmani) affinis. 

 Descriptio cum icone non omnino quadrat. Stolonifera; pro parte submersa; caulis laxus 

 foliis brevior (in icone longior); folia longe petiolata, lineari-lanceolata vel linearia, utrin- 

 que sensim attenuata; inflorescentia laxa, e verticillis 6 usque 8 composita; pedun< uli 

 graciles; stamina ut in S. graminea] fructus globosus, diam. ca. 6 mm; »achenes crenu- 

 lately crested, broadly winged, the broad margins laterally unicostate or narrowly winged; 

 (cum icone non quadrat; Fr. B.). Specimen in Georgia lectum (R. M. Harper, n. 718) laminam 

 coriaceam, pseudopenninerviam prabet, ergo affinitatem cum S. lantifdlia demonstiai. 



