153 [ 237 ] 



Hymennphyllus tewiifulius, (Piirsh.) Gravelly banks of the Missouri, above 

 L'liiau-qiii-court river; May 2i). 



Heleiduni aiitinnnale, |3 grand ijiorum, (Torr. and Gr.) Mouth of the St. 

 Peter's river; September 2, 



Achillea '//lillefuliuni, y occidcntale, (D. C.) Grassy ravines of the Mis- 

 souri hills ; June 14. 



Antennaria plantaghiea, (R. Br.) Dry hills, Upper Missouri; May 5. 



Antennarid dioica, (R. Br.) With the preceding; June II — -//•. 



Senecio bnlsainitm, (VVilld.) Dry hills near Council Bluffs; May 10. 



Senecio aureus, (Linn.) Prairies, Council Bluffs; alAindiint; May 16. 



iSe?iecio ifitegerri?nus, {^int) Grassy ravines, Upper Missouri; May 27. 

 Very smooth, and somewhat glaucous ; about two feet high ; aclienia 

 angularly sulcate. 



Senecio (undetermined.) Saline margin of Devil's lake ; July 31. No. 96, 

 Geyer. 



Arte?nisia lotigifolia, {^un.) Arid calcareous marl-hills near the mouth 

 of VVashtey, or Titon river. Upper Missouri. 



Artemisia dracu7iloides^ {Pnrsh) Sandy prairies, lakes and river banks, 

 between the Missouri and Mississippi rivers; common; July. 



Artemisia cana, (Puish.) Arid hills and valleys of the Missouri and 

 Shayen-oju rivers, &c.; June 14. 



Artemisia biennis^ (Nutt.) Arid banks of Spirit lake, &c.-, September 30. 



Artemisia dracuucnloides, var. 'I conescefis. (Torr. and Gr.) Sandy banks 

 and prairies of Jacques river — s.Jl. and Jr. 



Artetnisiafrii^ida, (Willd.) Shady prairies, Jacques river, &c.; July 18. 



Artemisia Canadensis^ (Linn.) With the preceding, and at DeviPs lake — 

 s.Jl. and Jr. 



Cirsiiini discolor, (Spreng.) Banks of Snake river ; July 8. 



Cirsiuni, (new species?) Fertile prairies around Devil's lake ; August 5. 



Cirsiuni undulatum, (Spreng.) Missouri hills, near Fort Pierre ; June 14. 



Cirsiuni, (new species'/) With the preceding. 



Sonchus pulc/iellns, (Pursh) — Lactuca pulchella, [D. C.) L. integri/olia, 

 (Nutt, gen.) Biennial stem, 1 — 2 feet high ; leaves nearly all rnnci- 

 nate ; upper (and sometimes most of tlie cauline ones) nearly or 

 quite entire ; heads 10 — 15, in a more or less fastigiate panicle; pedi- 

 cle about as long as the flower ; involucre glabrous, purplish ; inner 

 scales about 8; achenia deeply sulcate, glabrous, attenuate U[)wards 

 into a short beak ; pa[)pns silky, white, consisting of numerous soft 

 hairs in a smgle series. Banks of lakes and rivers. Upper Missouri ; 

 July 15. 



Lactuca, (new species?) — not in Herbarium — (Torr. and Gr.) Arid banks 

 of a lake firmed by Jacques river; July 15. 



Nabalus albus, var. serpeniaria, (Torr. and Gr.) Banks of Devil's lake ; 

 July 31. 

 var. suavis, (Torr.) N. suavis, (D. C.) N. albus, (Hook.) 

 Leaves very variable in tliis species. 



Nabalns race'nosus,{D. C.) Prairies, Devil's lake ; August 2. Stem often 

 simple; stem-leaves oblong, acute or obtuse, clasping; lowest ones 

 attenuate at the base; undulate tootbed. 



Nabalus IlUnocusis, (D. C.) Coteau des Prairies, Upper Sioux, or Tchan- 

 kasndata river; August 16. Stem 1.^ to 2^ feel high; lower part 

 sometimes nearly glabrous ; leaves erosely denticulate, 1 — 3 inches 

 long; heads 11 — 12 flowered. 



