Hippuris,] HALORAGEiE. ' 217 



bisulca, constans carpellis 4 concretis per paria approximatis, indehiscentibus, 1-spemiis, 

 lenticulari-compressis. Semina cum carpella concreta, albumine carnoso, embryone inverse 

 tei'etiusculo subincurvo, radicula longa supera, cotyledonibus brevissimis. — Herbae anmim 



n ■ 



aquaticcB tenerm glahrm. Folia opposita, Flores in axilUs solitarily minimi. DC, 



1. C verna; foliis trinerviis superne aggregatis majoribus, fructibus sessilibus, carpello- 

 rum dorso obtusiusculo. DC— Linn. Sp, PL p. 2. Engl Bot t. 722.-/3. intermedia; foliis 

 inferioribus linearibus obtusis aut emarginatis, superioribus ovalibus. Hoffm. — De Cand. 

 Prodr. V. 3. p. 70. Torrey, Fl. of Un. St v. I. p. 3.— C. verna. MicL Am. v. 1. p. 2.— C. 

 aquatica, Bi^eL Fl. Post ed. 2. p. 2.— C- heteropliylla. Pursh, FL Am. v. I. p. 3. 



Hab. Lakes and pools, Canada. Michaux. Saskatoliawan. Dr. Richardson^ Drummond, Bay of 

 Esclischoltz, (a csespitose var.) Chamisso. 



2. C. autumnalis; foliis omnibus uninerviis per caulem sparsis sequalibus truncatis, fruc- 

 tibus sessilibus, carpellorum dorso alato-menibranaceo. DC. — Linn. Sp. PL p. 2. Mich. 

 Am. V. I. p. 2. Torrey, FL ofUn. St. v, 1. p. 4. — C, linearis. Purshy Fl. Am. v. 1. p. 3. 

 — C. aquatica, /. Engl. Bot t. 722, {Jig. dextra.) 



Hab. Still pcJols, Canada; about Hudson*s Bay, aad as far north as Bear Lake, lat, 66°. JDr. Richard- 

 son, Drunimond. Moutli of the Columbia, Dr. Scouler. 



3. C. terrestris; foliis omnibus approximatis brevibus oblongis obtusis subsucculentis, 

 fructibus sessilibus latis brevibus emarginatis. DC. — " Rqfin. Med. Spec. xi. p, 358." De 

 Cand. Prodr. v. S. p. 71. Torrey, FL ofUn. St. v. 1. p. 4. — C. brevifoHa. Pursh, FL Am. 

 V. 1. jo. 3. 



Hab. Muddy places, near the Saskatchawan. Dnimmond. — I fear tliis will prove to he only a variety of 

 G. verna, growing in places less watery than usual. The specimens, however, entirely agree with those I 

 have received from Drs. Torrey and Schweinitz, gathered in the United States. 



Trib. III. HiPPURiDEiE. Link. 



4. HIPPURIS. Linn. 



Calycis tubus ovario adnatus; limbus minimus integer, Petala 0. Stamen 1 calycis 

 margini insertum. Stylus filiformis antberje sulco receptus. Nux 1-sperma, calycis limbo 

 marginato coronata; endopleura tumida carnosa (ex Rich.); embryonis radicula cylindracea 

 cotyledonibus longior. — Herbge aquaticcB, caide simplici, foliis verticiUatis Unearihus acutis, 

 infimis longioribuSf floribus axillaribus sessilibus minimis, nonnullis scepe ahortu fcemineis 

 aut neutris. 



1. H. vulgaris; foliis 8-12 linearibus acutis a^ice spliacelatis. Linn. Sp. PL p. 3. Engl. 

 Bot. t. 763. Mich. Am. v. I. p. 1 ? Pursh^ FL Am. v. L ^. 3 ? Torrey, FL of Un. St. v. I. 

 p. 2. Bich. in FrankL 1st Journ. ed. 2. App. p. 2. — y. foliis inferioribus pluries longioribus 

 membranaceis apicibus intactis. 



Hab. Pools of water and margins of lakes, from Canada as far north as lat. 60*^. Dr. Richardson, 

 Drummond. Newfoundland and Labrador. Dr. Morrison. Cape Hope, in Behring's Straits. Chamisso. 

 j8. In deep water, phuns of the Saskatchawan. Dr. Richardson, Drummond.^The specimen from New- 



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