Artemisia annua, L. Leaves twice pinuatifld, glabrous; divisions of tlie 



lower leaves lanceolate, incised, of the upper linear, pectiiiatelj- pinnatifid; 

 flowers panicled, globose, nodding. Northern Persia, Siberia, and China. 



Lifimvus' Syst. Veg., 16th ed., cur. Sprengel. 



This was probably first brought to Keokuk as a cultivated ]ilant, 

 but has become a common weed. 



EcHiNOSPERMUM Redowskii, Lehiu., var. occidentale, Watson. The 



American plant is less strict, at length diffuse, and the tubercles or scabrosi- 

 ties of the nutlet are sharp instead of blunt or roundish as in the Asiatic 

 plant. Plains. Saskatchewan and Minnesota to Texas, and we.st to Arizo- 

 na and Alaska. Grny\s Synop. Fl. N. Amer., 190. 



The typical form of this species is a native of Xorthein xVsia. 



PoTAMORETON Illinoensis, Moi'ivig. Floating leaves opposite, thick, 



coriaceous, oval or ovate, 2-3 inches long by IH broad, 19-*23 nerved, on 

 short petioles, submerged leaves comparatively few, oblong-elliptical, acute 

 at each end, usually ample (the largest nearly 8 inches long and l^.j wide), 

 nearly or quite sessile, the uppermost opposite ; stipules free, obtuse, strong- 

 ly bicarinate, about 2 inches long; peduncles often chi.stered at the summit 

 of the stem ; spikes about 2 inches long, densely flowered ; fruit roundish ob- 

 ovate, 3 -keeled on the back, the middle keel prominent, and sometimes 

 shouldered at the top, flattened and slightly impressed on the sides, obtuse 

 or occasionally pointed at the base, the style short and uearly facial. Al- 

 lied to P. li/cens, L. in habit, but with larger fruit, and in foliage quite dis- 

 tinct. Mississippi River bottoms near Oquawka, 111., Englewood, 111. Bot. 

 Gazette, V, 5(X 1880. 



Sagittaria cristata, Engebn. irwd. Flowers oulj- of the lowest 



whorl fertile ; fruit-heads much larger than in S. graminea ; achenia broad, 



with a conspicuous horizontal style, and crested back and sides. Dr. 



Engelmann adds that this is near <§. graminta, Miclix., and is perhaps only 

 a variety of it, although the only other Sagittaria with such crests to the 

 achenia is 8. natans, Michx. Further observations are needed to eventually 

 place it correctly. Letter dated March 15ih, 1882. 



Beckmannia, Host. Panicle racemose, contracted ; spikelets com- 

 pressed, 2-flowered, the upper floret an abortive rudiment ; glumes obovate, 

 compressed boat-shaped, equal, a little shorter than the flower, pointless; 

 palets membranous, the lower ovate, mucronate, 3 -nerved, the upper 

 2-nerved, bifid ; grain free. 



B. ERUC^.FORMis, Host. Culuis stout, l-S^^ feet high, with the sheaths 



glabrous ; ligules elongated ; leaves linear, 4-8 inches long, flat, scabrous ; 

 panicle 4-12 inches long, erect, strict, secund, the short crowded branches 

 densely flowered from the base, glabrous ; spikelets sessile, imbricately ar- 

 ranged in two rows, nearly orbicular ; rudimentary floret stipitate. Flor. 

 Col., Port, and Coul. 



