Seventeenth Annual Meeting. 119 



55. Eragrostis tenuis, Gray's Mao., 2d ed. 564, and 5th ed. 632. ( Poa trichodes, Nutt. 

 PI. Ark. 1 It!.') 



36. Melica mutica, Walt., var. diffusa, Gray's Man. 626. ( M. diffusa, Pursh., M. glabra, 

 Mx„ Nutt. PL A.rk.148.) 



59. I'niola latifolia, Mich., Nutt. Fl. Ark. 14S, Gray's Man. 636. Distichlis rnaritima, 

 Raf. var., strictum, Thurb. Pot. Calif., II 306. (Uniola strieta, Torr., Uniola multiflora, 

 Nutt. FL Ark. 1 IS. Prizopyrum spicatum, var. strictum, Gray.) 



35, 36a, 44. Poa flexuosa, Muhl., Gray's Man. 630. 



!•">. Poa coiupressa, L., Gray's Man. 629. 



61. Festuca elatior, L., Gray, 1. c. 634. 

 7. Festuca tenella, Willd., Gray, 1. c. 633, Nutt. Fl. Ark. 141 ( sub-var. glauca.) 

 5, 32, 33. Bromus; the specimens are all probably B. ciliatus, L. They differ some- 

 what from t lie more eastern plant, but I am unable to separate them. Our North- 

 American Promi are as yet very imperfectly identified. 



31. Agropyrum glaucurn, R. & S., var. occidentale. Glumes narrower and more 

 acute than in the European plant. This has been referred to Triticum repens, L., by 

 most American authors, but it is abundantly distinct. 



56. Hordeum pusillum, Nutt., Gen. I 87, Fl. Ark. 151. This species has been united 

 with H. nodosum, L., ( H. pratense, Huds.,) by recent American authors, but it is well 

 characterized by its broad outer glumes, as well as by its usually lower and more rigid 

 habit of growth. 



23, 24. Elymus Canadensis, L. Gray's Man. 639, Nutt. Fl. Ark. 151. 



EXPLANATION OF PLATES. 

 Plate I. — Chloris verticillaia. 

 Fig. 1. Habit of the species, reduced. 

 Fig. 2. Spikelet, much enlarged. 

 Fig. 3. Same with the two lower glumes removed. 

 Fig. 4. The stipitate imperfect floret. 



Plate II. — Munroa squarrosa. 

 Fig. 1. Habit of plant. 



Fig. 2. Cluster of leaves terminating a branch and inclosing the inflorescence, enlarged (original). 



Fig, 3. Spikelet, much enlarged. 



Fig. 4, 5. The lower glumes. 



Fig. 6. Flowering glume. 



Fig. 7. Palea. 



Fig. 8. Pistil. 9. Seed. 



Plate III. — On Kosleria and Estonia. 



Fig. 1. Spikelet of Kuderia cristata, from European specimen. 



Fig. 2. " " " cristata, from Montana. 



Fig. 3. " " " from specimen in Herb. Acad. Nat. Sci., Phila., ticketed by Nuttall "K. 



Arkamana." 



Fig. 4. Spikelet of Cceleria, from specimen coll. by Bigelow, probably in New Mexico. 



Fig. 5. " " " nitida, Nutt. — from Kansas. 



Fig. ti. " ' ' " from Californian specimen collected by Miss Scott. 



Fig. 7. Katonia. — Spikelets three-fold. 



Fig. 8. Katonia. — Panicle nutant, open and loosely few-flowered. A well-marked form with unu- 

 sually large and three-fold spikelets. 



Fig. 9. Eatonia. — Pale;c remarkably lung, equaling or exceeding their glumes. 



Fig. 10. Eatonia. — Pale* much shorter than their glumes. 



Fig. It. Eatonia Pennsylvanica, from specimen supposed by Dr. Vasey to be a hybrid between E. 

 IVnnsylvanica and Trisit urn palustre. 



Fig. 12. Eatonia Pennsylvanica — from Louisiana. 



Fig. 13. Eatonia Pennsylvanica — from Kansas. 



Fig. 14. Eatonia obtusata — with unusually long and large lower glume. 



Fig. 15. Eatonia obtusata — from Kansas, genuine form. 



(These figures are all enlarged to the same scale.) 



