J- 



4 



V 



sent me, as well as those from Pennsylvania, are subglobose, from 

 which I infer that in these localities this is the prevailing form. 



Explanation of the Plate. — Pkysalacria inflata. — Fig. i. a cluster of 

 plants. Fig. 2, a single plant enlarged. Fig. 3, three cystidia x 400. Fig. 4, five 

 basidia, one of them bearing two spores x 400. Fig. 5, six spores x 400. 



Secotiutn Warnei, — Fig. 6, an obovate plant. Fig. 7, a small ovate plant with 

 a distinct stem. Fig. 8, a small subglobose umbonate plant. Fig. g, vertical sec- 

 tion of an oblong plant, showing the hymenial plates and percurrent stem,. Fig. 10, 

 a basidium bearing four spores x 400, Fig. ii, seven spores x 400, 



Additions to tlie Flora of the United %\2X%%.— Crataegus arbores- 

 cens^ Ell, is not uncommon in the rich alluvions of the Mississippi 

 River, near St. Louis, and probably inhabits the banks of this river 

 and its lower tributaries down to its mouth. It has not been recog- 

 nized of late and seems to be quite rare in herbaria, and is probably 

 not in cultivation. I have not much to add to Elliott's, Torrey and 

 Gray's and Chapman's descriptions, but may say that in this neigh- 

 borhood it is the largest species of the genus, making trunks from 8- 

 12 and, as Mr. Eggert informs me, even 18 inches in diameter, 5-7 

 feet high, fluted or grooved, and with a broad top, rarely bearing any 

 thorns. The leaves,cuneiform at base, undivided or,at the end of shoots, 

 3-lobed, resemble in form those oi C,tomentosa^\)\\'i are smaller, much 

 thinner and smoother, even when young, often with soft down in the 

 axils of veins underneath; flowers in loose corymbs, only 7 or 8 lines 

 wide; calyx smooth, neither pubescent nor glandular, with triangular 

 acute lobes; styles 5; drupes depressed-globular, 4-5 lines thick with 

 5 (or rarely more) stones grooved on the back, bright red or rarely 

 orange-colored, persisting through winter, when those of our other 

 species, C, coccinea^ Crus-galli^ siibvillosa and iomeniosa drop off. 



Sagittaria natans^ Michx., has bden noticed by Mr. C. E. Faxon, 

 since a number of years in Charles River, Mass., " at the depth of 2 

 to 4 feet, and entirely above the influence of tide-water," and also, as 

 he informs me, in Neponset and in Ipswich Rivers, where Mr. J. Rob- 

 inson found it. It flowers there from the middle of June to the end 

 of July, but never perfects fruit, and thus is evidently not at home 

 in those northern waters, where it has a precarious existence by 

 stolons; these can only winter where deep water protects them from 

 frost. The seed was probably first brought there from the South, by 

 water-fowl who disseminate so many water-plants. Scape and phyl- 

 lodia 2-4 feet long, barely reaching the surface of the water, leaf- 

 blades rarely developed, and then linear-lanceolate; raceme as well as 

 pedicels often elongated in order to reach air and light ; flowers 6-7 

 lines wide, opening in forenoon, submerged again toward evening, 

 only one or two of the lowest whorl fertile, the others all male; male 

 flowers with 6 exterior and i or 2 central stamens ; filaments about 

 as long as the nearly orbicular anthers, bulbous at base and smooth ; 

 pistils of the female flowers numerous, minute, erect, style as long 

 as the ovary; fruit (never matured in the North) in southern speci- 

 mens marked by several (5 or 7) denticulate crests on back and sides. 

 Sagittaria pusilla, Pursh., must be considered as a subterrestrial 

 form of this species, distinguished only by its size and by a 3^ crested 

 achen, S. graminea, with which I had confounded the northern 



