50 Steele — ^iddifliniK t<> the yiorn of lV(/.'</ii/ii/f(»i. 



specimens, some well developed, August ]. 1!)0(). In llritlon and Brown's 

 Flora the northern limit of this species on the Allantic coast is given as 

 North Carolina. 



*893. Lophotocarpus calycinus (Engelm.) J. 0. Smith. 



Eastern Branch below Navy Yard, growing in tide mud: also below 

 Alexandria, September 4, IS!)!). Apparently scarce within our limits. 

 *8g4a. Sagittaria Engelmanniana ,1. G. Smith. 



First collectetl, in sterile condition only, in a swampy pasture near 

 Ardwick, Md., September (i, 189!). Two or three fruiting specimens were 

 found on the water's edge at Great Falls, October 3, 18!)!). This extends 

 the known range of the species, and proves that it is .sometimes dioe- 

 cious. Determination confirmed by Mr. J. (i. Smith. 



894^*. Sagittaria pubescens Muhl. 



Very common in swamps, springy places, and ditches. l)ul in my ex- 

 perience not fovnid in or close to open water. Il reaches Ihe edge of the 

 river marsh, but I have not observed it far inside. 



I have been somewhat inclined to regard this plant as siiecihcally dis-: 

 tinct from S. latlfoUa, and as Mr. J. G. Smith is willing to be quoted in 

 support of this view, I feel warranted in restoring it. The leaves greatly 

 resemble in form those of typical latifoUn. They vary in length from 

 4 inches to a foot, including the lobes, and are rounded or obtusely an- 

 gled at the apex, ditfering somewhat in the length of the lobes, which, 

 however, are usually moderately shorter than the blade: but they do not 

 run into the well known eccentricities of the latifoUu forms. A very 

 characteristic feature is found in the involucral bracts, which are at 

 least as broad as long, of a yellowish white and translucent hue, and 

 densely hirsute-pubescent. 

 *Sg4c. Sagittaria longirostra (ISlicheli) J. G. Smith. 



In moderate ([uaiilily in the marsh around the mouth of Oxen Run, 

 opposite Alexandria. August 18. ]!)()(), 

 *i203a. Andropogon Elliottii ( liapm. 



Bright wood i*ark Swamp, September 20, 18!)(): Connecticut A\enue 

 Bridge, October 7. 18!)(). 



*i204a. Andropogon Halepensis (L.) Ihot. 



Rather common ai'ound (himping grounds. Tlie cultivated sorghum 

 and broom corn also appear occasionally in tiiese situations. 



*ii9ia. Panicum Walteri Pursh. 



Shore west of bathing beach, September 2, 18!)7. 

 1178. Panicum agrostoides Trin. {P. (tf/rostuJifafi/ic of iiritton and 

 Ih'own.) 



River swamp. Brick Haven, October 10, iSIMi; also South Washington 

 and below Alexandria. 

 *ii78a. Panicum longifolium Torr. 



Kenilworth Swamp, August 28. 18!)7. Also swamp above Hj^attsville. 

 1187a. Panicum sphaerocarpon Ell. 



Flats liear mouth of Oxen Run, July 1, IS!)!). Also Arlington. 



