88 



Alismaceae 



Lophotocarpus 



Jan. 



Feb 



Mar 



Apr. 



May 



June 



July 



Aug. 



Sept. 



Oct 



Nov. 



Dec. 



Miles 



50 



Map 108 

 .opfiotocarpus calycinus 

 (Engelm.) J. G. Smith 



~ 30 



Map 109 



Sagittaria latifolia Willd. 



76. LOPHOTOCARPUS Th. Durand 



1. Lophotocarpus calycinus (Engelm.) J. G. Smith. Map 108. Re- 

 stricted to the southern part of the state where it is found in artificial 

 ponds and in sinkholes. All of my specimens were found in such habitats 

 except one, which was from a muddy slough along White River in Greene 

 County. When once established in a pond or sinkhole, it soon becomes the 

 dominant plant, usually almost crowding out all other species. It is fast 

 migrating northward, and I now find it in places where it was absent 20 

 years ago. None of our early authors reported it. Probably introduced. 



Del. to S. Dak., southw. to Ala. and N. Mex. 



la. Lophotocarpus calycinus f. maximus (Engelm.) Fern. (Rhodora 

 38: 73. 1936.) This is a very wideleaf form with blades up to 3 dm wide 

 and with 18-21 nerves. Miss Edna Banta found it in an artificial pond 

 in Jefferson County. 



Ohio and southw. 



lb. Lophotocarpus calycinus f. depauperatus (Engelm.) Fern. (Rho- 

 dora 38: 73. 1936.) I collected a specimen of this form in an artificial 

 pond on the August Bocard farm on the road between Corydon and Mill- 

 town, about a mile south of DePauw, Harrison County. 



78.[SAGITTARIA L. Arrowhead 



Leaves all sagittate, rarely somewhat hastate, or some without lobes, the basal lobes 



as long as, shorter, or longer than the terminal one; pistillate heads never sessile; 



filaments of stamens glabrous. 



Bracts ovate, obtuse or rarely merely acute, usually 4-8 (10) mm long; achenes 



mostly 2-3 mm long; beaks of achenes, 0.5-2 mm long, horizontal, arising from 



the inner margin and pointing inward; leaf blades usually about 1.5 dm long 



(sometimes up to 4.5 dm long or as short as 3 cm long). 



Bracts and pedicels pubescent. (See excluded species no. 35, p. 1024.) 



S. pubescens. 



Bracts and pedicels glabrous ; scape not ribbed or rarely so ; faces of achenes not 

 keeled or crested. 



