18 



[ad fl. Manitsch (S. G. Gmel.)] , in provinclis caucasicis (M. a Bieb.) 

 et Sibiria baikalensi (Timcz.). 4. 



Radix soiitaria. Prolificationes sessiles. Fronrles obovatae, con- 

 vexiusculae, subtus spongioso-convexae. 



920. Spirodela. Schleiden. 



in Linnaea XIII, p. 391. — Endlicher gen. Suppl. I, p. 1370. — Meisn. gen. 

 p. 363. — Comment. p. 271. 



Flores masculi 2. Filamenta inferne angusta. Ovarium biovula- 

 tum. Ovula erecta anatropa. Stylus . . . Fructus ... 



1. S. polyrhiza Schleiden /. c. p. 392. 



Lemna polyrhizn. L. Spec. p. 1377. — Kalm Fl. fennic. No. 516. — Stephan 



Fl. mosq. No. 625. - Georgi Beschr. d. Russ. tt. III, 5. p. 1277. — M. 



a Biee. Fl. t. c. III, p. 610. — JtjNnz. Fl. lilhuan. p. 275. — Mart. Ft. 



mosq. p. 159. — Besser Enum. p. 36, No. 1181. — Hofft Cat. liursk. 



p. 3. — Eichw. Ski<sse p. 114. — Weinm. Fl. petropol. p. 4. — Hohenack. 



Enum. Taliisch. p. 12. — Fleisch. et Lindkivt. Fl. d. Ostseeproo. p. 14. — 



VVikzbn Cnsan. No. 657. — Karel. et Kiril. Enum. pl. des. soongoro- 



kirghisici No. 843. 

 Lemna baimatica. Waldst. et Kit. 



Lemna orbicularis. Kit. in Schult. Osterr. Flora ed. 2, p. 64. 

 Leiniia major. C. A. Meyep. Ind cauc. p. 11. 

 Lenticula pulyrhiza. Lam. Fl. franc. II, p. 189. 



Hab.inRossia sep t e n tr i na li [Fennia (Kalm)], media [Pctropoli (Weinm.), 

 Esthonia, Livonia! et Cnronia iFleisch. et Lindem.), Lithuania (Jundz., Eichw.), 

 Volhynia (Besskr) , Mosqua 'Stephan, Mart.) , Kursk (Hofft) , Pcnsa! 

 (Jacquet pl. exs.) , Kasan (Wirzen)J et australi [Podolia (Besser], in 

 provinciis caucasicis (M. a Bieb.) [in Awhasia et Mingrelia (Nordmann), 

 versus 111. casp. pr. castelluni Kasijurt (C. A. Meyer) et Lenkoran! (Hohenack.)] 

 inque Sibiriae altaicae deserto soongoro-kirghisico pr. fl. Lepsa! (Karel. 

 et Kiril.). 4. 



Fronrles omnium maximae, geminatim-quaternatim conjunctae, ses- 

 siles , suborbiculato-obovatae v. ellipticae , supra planiusculae, subtus 

 convexiusculae et violaceo-purpureae, radicibus fasciculatis instructae. 



Ordo CWVIII. Najadeae. Endliclier gen, p. 22U. 



Flores ut plurimum monoici, rarius dioici, rarissime hermaphro- 

 diti. Perigonium in masculis saepissime nullum, nunc ejus loco tu- 

 nica membranacea cellulosa, simplex , antheras extus vestiens, irregu- 

 Jariter rumpens v. apice subregulariter fatiscens, rarius cupulaeforme, 

 antheram basi recipiens, interdum squamaeforme : squamis intus anthe- 

 riferis, cuui ovariis combinatis, floris hermaphroditi perigonium prae- 

 bentibus. Antherae filamento brevi v, plus minus longo sustentae, 

 nunc omnio sessiles, nunc uniloculares evalves, apice ruptae v. bivalves, 

 nunc 2 — 4locuIares: Joculis ut plurimunl connectivb plus minusve crasso 

 sejunctis , longitudinaliter dehiscentibus. Pollem globosum v. e filis 

 confervoideis , dense compactis. Ovaria nunc solitaria, nunc 2 v. 4 

 approximata, dorso convexa, facie plana, contigua sed libera, rarissime 

 casi cupula annulari cincta , sessilia v. interdum suspensa v. singuia 



