95 



green, loosely cellular, almost globular, about ,',, of an inch in 

 diameter with a circular bordered opening beneath, no rootlets 

 This genua is interesting as containing the smallest known flower- 

 iny plants. 



ALISMACEiE. Water- Plantain Family. 



ALISMA, 1,. Water Plantain. 



2417. A Plantago, L var. Ameiucan i.u. Gray. 

 Ditches and marshes. Common. July. (B.) 

 SAGITTABIA, L. Arrow-head. 



2418 S. variabilis, Engelm. (Arrow-leaf) 



Margins (if lakes and streams. A beautiful and most variable plant. 

 Here 1 believe is a fine field for useful original work. The very 

 different forms seem to be largely due to environment. With a 

 little care seeds from the most marked forms could be collected 

 and grown under different circumstances and the results recorded. 

 We have here, common, all the four varities mentioned in Gray's 

 Manual, 6th Edition. 



var. OBTUSA. Leaves large obtuse. Dioecious. 



var. i, aim folia. Leaves large, acute. Monoecious. 



var. angustipolia. Leaves with linear diverging lobes. 



var. DIVERSIPOLIA. Leaves, some lanceolate others sagittate. 



2420. S. HETEROPHYLLA, Pursh. 



Muddy shallows. Common. .Most of the leaves not at all sag- 

 ittate or on one side only. Flowering stem weak, procumbent in 

 fruit. We have all the 3 varieties mentioned in Gray's Manual. 



var. blliptica, Engelm. Leaves broad. 



var. bigida. Engelm. Leaves narrowly lanceolate, rigid. 



var. ANGUSTIPOLIA, Engelm. Leaves nearly linear. 



2421. S. GRAMINEA, Mx. 



Gilmour's Piling Grounds, Hull. Leaves all submersed, grass-like. 

 NAIADACE^. Pond-weed Family. 

 TRIGLOCHIN, L Arrow-grass. 



-' I-'."). T. MAIM TIM A. L 



'/". ma ni i at it ni , L. var. elatum, Gray. 



Peat-bog Ai the Gas-spring, Mer Bleue and Casselman. A 



