80 Trans. Acad. Sci. of St. Louis. 



longer than the equal and acuminate flowering glume and 

 palet, lanceolate, scarious margined, strongly 1-nerved, the 

 short cusps minutely barbed and the upper portion of the 

 glumes minutely serrulate; basal hairs rather copious, half of 

 the length of the flowering glume ; flowering glume lanceo- 

 late, 3-5 nerved, the nerves scabrous, obtuse, but the middle 

 nerves excurrent as a minute cusp. — Plate XII. 



Type locality : near Sibley, Jackson County, Missouri ; col- 

 lected by K. K. Mackenzie, No. 637, October 14, 1901 ; type 

 in Herb. K. K. Mackenzie, duplicate in Herb. Missouri Bo- 

 tanical Garden. 



Rocky ground at the foot of low wooded bluffs along the 

 Missouri River near Sibley, Jackson County, Missouri. This 

 species is most closely related to M. Mexicana (L. ) Trin. It 

 is distinguished by its long exserted densely flowered inflo- 

 rescence, its smaller spikelets and larger and more copious 

 basal hairs. 



The type specimens are the only ones known. 



Iris foliosa n. sp. 



Perennial from stout rootstocks; stems 20-38 cm. high, 

 glabrous, usually very flexuous; leaves green, not glaucous, 

 12-28 mm. wide, strongly many nerved, the lower often 

 over 6 dm. long and much exceeding the culm, the upper 

 short, and the uppermost one or two sometimes but 7.5 cm. 

 long; flowers axillary on pedicels 20-28 mm. long; bracts 

 scarious, 3.75-7.5 cm. long, reaching beyond the perianth tube 

 and in fruit loosely inclosing the capsule; perianth tube 14-22 

 mm. long ; perianth segments about 3.75 cm. long, spread- 

 ing, not crested, bluish; capsule oblong-cylindric, hexagonal, 

 3.75 cm. long or less, abruptly contracted at the apex and 

 short beaked; seeds in two rows in each cell. 



Type locality: Little Blue Tank, Jackson County, Missouri ; 

 collected by K. K. Mackenzie, June 6, 1897; type in Herb. 

 K. K. Mackenzie, duplicate in Herb. Missouri Botanical Gar- 

 den. Grows in dense masses in low open dry woods and 

 prairies in Kentucky, Illinois, Missouri and Kansas. This 

 species is distinguished from Iris hexagona Walt., a species 

 of the Southern States, to which it has been referred by Wat- 



