l8 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



* Ruppia pectinata. 



Intricately branched and very leafy ; internodes very short : leaves 

 filiform, 3—5 cm. long: stipules h^-aline, 7—10 mm. long, i— 1.5 mm. 

 wide at the base, adnate their whole length, seldom with a small 

 round free tip ; peduncles 3-5 cm. long, straight, or in fruit re- 

 curved, but apparently not spirally curved ; pedicels about i cm. 

 long; fruit ovoid, 1.5 mm. long, with an almost sessile stigma. 



It most resembles a short-peduncled form of R. inaritiina^ from 

 which it differs in the fruit, which is smaller, not long-beaked as in 

 that species, and not oblique. R. occidciitalis has both the leaves 

 and stipules much longer and the fruit is pear-shaped. R. fcctinata 

 somewhat resembles in habit Potcnnogcton pccf/)iafiis, hence the name. 

 It grows in brackish ponds. 



Yellowstone Park : 1884, Ticcedv, 32^. 



SCHEUCHZERIACEAE. 



Triglochin palustris L. Sp. PL 338 [Man. R. M. 364; Morong, 



Mon. 6 ; 111. Fl. i : S3 ; Bot. Cal. 2 : 199] . 



In marshes, up to an altitude of 1500 m. 



Montana: Dillon, July 7, 1895, Rydbc?'g, Belt Canon, 1886, R. 

 S. Williams, 363. 



Triglochin maritima L. Sp. PL 339 [Man. R. ]M. 364; Morong, 



Mon. 8 ; 111. Fl. i : 83 ; Bot. Cal. 2 : 199] . 



Common in salt marshes up to an altitude of 2500 m. 



Montana: East Gallatin Swamps, July 24, 1896, Flodiuaii, Au- 

 gust, 1887, R. S. Williaius, 631 ; Boulder Creek, 1883, Scribncr, 

 301 ; Missouri River, 1882, Caiiby. 



Yellowstone Park : Hot Springs, 1884, Tzcccdy, 363, 1888, 

 Rev. Dr. C. //. //a// ; Lower Geyser Basin, Aug. 4, 1897, Rvd- 

 herg tC- J3csscv, 3/36. 



ALISMACEAE. 



Alisma Plantago L. Sp. PL 342 [111. FL i : 85 ; Bot. Cal. 2 : 200] 

 var. Aiucricaiia Gra}', Man. Ed. 2 : 438 [Man. R. M. 361]. 

 In shallow water and wet ground, up to an altitude of 1500 m., but 



rather rare in the region. 



.. Montana: Bozeman, 1892, Mrs. Aldcrsoii. 



Alisma Geyeri Torr. in Nicollet, Rep. Hvdrog. Upper Miss. 162. 

 1843. 

 The species was discovered during the Nicollet expedition on 



