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 

 slumes 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 E. 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- 



