58 * r - Buchenaü. — Alismataceae. 



29. S. subulata (L.) Buchenaü in Abh. Nat. Ver. Brem. II. (187 4) 490. — Älismq 

 subulatum L. Spec. pl. ed. 1, I. (1753) 3i3. — Sagittaria natans Michx, Fl. bor. amer. 

 II. (1803) 1 90; Pursh, Fl. of N. Amer. (1 81 4) 253. — Sag. pusilla Nutt. Gen. of N. Amer. 

 PL II. (1818) 213; Kunth, Enum. pl. III. (l 84 1 ) I 60 (S. pusilla Nutt. et natans Michx.) ; 

 Micheli in DC; Monogr. Phaner. III. (188!) 7 5 (S. natans Michx. cum var. fi. lorata 

 Chapm.); Smith in Rep. Miss. Bot. Garden VI. (18 9 4) 18, t. 13, 14; Britton and Brown, 

 Illustr. Fl. North. Un. St. I. (1896) 92. — Maxime variabilis. Perennis, stolonifera et 

 tuberifera (interdum proles primi anni florens?). Submersa. Folia omnia fluitantia, 

 linearia vel lorata ,. vel laminae foliorum nonnullorum natantes; flores emersi; folia 

 natantia ovata, nunquam sagittiformia. Inflorescentia plerumque parva; bracteae fere 

 totae in spatham connatae; pedunculi graciles, fertiles (interdum unicus!) serius incras- 

 sati et recurvati ; flores mediocres (diam. usque 1 5 mm) ; stamina 7 vel 8 ; filamenta 

 basi dilatata glabra; antherae suborbiculares (?). Fructiculi ca. 2 mm longi, stylo apicali 

 gracili coronati, tri-vel quinque-alati, alis plus minusve crenulatis. 



Var. tres sequentes, sed vix satis diversae, distingui possunt. 



u. pusilla (Nutt.) Buchenaü. — S. natans var. lorata As. Gray, Manual, ed. 5. 

 (1867) 49 4 non Chapman — Humilis; fere tota submersa. Folia plerumque phyllodina, 

 erecta, rigidiora, 5 usque 1 5 cm longa, rarius in laminam lineari-lanceolatam, 2 usque 

 3 cm longam desinentia. Inflorescentia parva, verticillis 1 usque 3, a foliis superata. 

 Fructiculi dorso et lateribus subcrenato-alati. 



ß. natans (Michx.) Smith I.e. 18. — S. natans Michx. var. lorata Chapman, FI. 

 South. Un. St. (1860) 449. — Fere tota submersa, fluitans, saepe plus minusve elongata. 

 Folia pro pte. natantia; lamina elliptica, obtusa, basi obtusa vel rarius truncata, tenuis, 

 trinervis, 2 usque 5 (raro 6) cm longa, et 2 usque 3 cm lata; nervi omnes e basi 

 laminae Orientes. Verticilli florum 2 usque 4. Fructus diam. 8 mm; fructiculi distinetius 

 crenato-alati. 



Nota. Haec varietas similis est Elismati natanti. 



y. gracillima Smith 1. c. 19. — S. natans var. (?) gracillima Wats. in A. Gray, 

 Man. ed. 6. (1890) 556, teste Smith 1. c. — S. natans Engelm. in Bull. Torr. Bot. 

 Club IX. (1882) 4. — Submersa. Folia linearia, flexuosa, usque 12 dm longa, vix 2 mm 

 lata, obtusa, vel rarius in laminam lanceolatam, trinerviam, 3 usque 4 cm longam et 

 6 usque 8 mm latam desinentia. Caules fluitantes, folia aequantes, flores tantum emersi; 

 verticilli florum 2 usque 6 ; pedunculi 3 usque 1 cm longi. Fructus maturi ignoti. 



In den östlichen Vereinigten Staaten von Massachussets bis Florida und Alabama 

 verbreitet. Die drei Formen sind wohl mehr Standortsformen (von der Tiefe und Be- 

 wegung des Wassers abhängig) als selbständige Varietäten. 



Nota. De variabilitate foliorum S. subulatae vide Wächter, Beiträge, in Flora LXXXIII. 

 1897) Heft 3. 



30. S. filiformis Smith in Rep. Miss. Bot. Garden VI. (189 4) 20, t. 15. — Sub- 

 mersa. Caules filiformes, 6 usque 12 dm longi. Folia filiformia, 1,5 usque 6 dm longa et 

 2 usque 3 mm lata. Inflorescentia panniculata; brachia et pedunculi filiformes, 4 usque 

 10 cm longi; verticilli 8 usque 10; bracteae lanceolatae, 3 usque 5 mm longae; flores 

 pauci, basilares feminei, ceteri omnes masculini; flores parvi, diam. 10 usque 12 mm; 

 sepala ovata, obtusa; petala alba; stamina 7; filamenta e basi latiore angustata, glabra, 

 antheris longiora. Fructus maturi ignoti. 



In ruhigen Gewässern flutend, nur die Blüten aus dem Wasser hervorragend. 

 Florida und Alabama. 



Nota. Mihi ignota. Diagnosis seeundum cel. Smith. — Planta memorabilis, insignis foliis 

 et caulibus filiformibus. — Species imperfecte cognita, sed certe S. subulatae var. graciUimat 

 proxirna. 



Nota. Cel. Smith 1. c. pag. 6 hanc plantam sub 



»♦♦Fertile pedicels much thickened, reflexed in fruit« 

 enumerat. In icone pedunculi fertiles non incrassati delineati sunt. 



