OF ARTS AND SCIENCES : FEBRUARY 13, 1872. 403 



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492. Potamogeton pusillus L. Dry fruit slightly keeled. 493. 

 Yar. ? with fruit roundedand even on the back, and with a subdorsal 

 nerve on each side. 



494. Potamogeton pectinatus L. ; Hook. 1. c. In a pond at 

 the Dalles of the Columbia. 



495. Potamogeton Robbinsii Oakes ; Robbins in Gray, Man. 

 p. 490. With flowers and some well-formed fruit ! The latter has 

 hardly been collected before. 



496. 497. Lemna minor L. 498. L. polyrrhiza L. 



499. Lysichiton Kamstchatense Schott. Arctiodracon Gray. 

 Symplocarpus Bongard. Three or four scapes and leaves of this rare 

 plant only collected. 



500. Sparganium simplex Hudson ; Engelm. in Gray, Man. 



501. Alisma Plantago L., var. Americanum Gray, Man. 1. c. 



502. Sagittaria variabilis Engelm. in Gray, Man. 1. c. : large 

 form. 



503. Anacharis Canadensis Planchon ; narrow-leaved form : 

 sterile. 



504. Habenaria hyperborea R. Br. ; a slender form. 



505. Habenaria dilatata Gray in Sill. Jour. p. 311, &c. With 

 bright white flowers. 



506. Habenaria elegans. Platanthera elegans Lindl. Gen. & 

 Spec. Orch. p. 285. 



507. Habenaria fcetida S. Watson, Bot. King Expl. p. 31. Pla- 

 tanthera foetida Geyer in Hook. Kew Jour. Bot. 7, p. 376. 



508. Goodyera Menziesii Lindl. 1. c. Spiranthes decipiens 

 Hook. Fl. Bor.-Am. 2, t. 204. 



509. Spiranthes Romanzoviana Chamisso ; Gray, Man. p. 504. 



510. Listera cordata R. Br. A few specimens of the larger 

 western form. 



511. CORALLORHIZA MULTIFLORA Nutt. ; Hook. 1. C. 



512. Corallorhiza Mertensiana Bongard; Hook. 1. c. A well- 

 marked species, scantily collected, as well as the next. 



512 a . Corallorhiza striata Lindl. Gen. & Sp. Orch. p. 534. 

 C. Macrcei Gray, Man., is clearly the same. 



513. Cypripedium passerinum Richardson ; Hook. 1. c. p. 205. 



514. Iris tenax Dougl. in Bot. Reg. t. 1218. 



515. Sisyrinchium tinctorium HBK. ; Klatt in Linnaea, 23, 

 p. 82. S. lineatum Torr. A yellow-flowered species. 



