422 TRELEASE— THE DESERT GROUP XOLIXE.E. [April 21, 



Central ^Mexico. In the region of X. Hartwcgiana? 

 Specimens examined : Zacatecas. Sierra Madre ^lountains 

 (Rose, 2^g6, 1897, — the type). 



Lower panicle divisions considerably longer than the triangular 

 bracts. Shortly caulescent. Leaves much shorter than the in- 

 florescence. 



N. rigida Trelease. 



Anatis rigida Brongniart, Ann. Sc. Nat., Bot. ii. 14: 320. 1840. 



Leave.s 4-5 mm., scarcely 10 cm. long, ciliate-scabrotis. Inflores- 

 cence much surpassing the leaves, sessile, with broad divisions 

 about 10 cm. long and rather few branchlets scarcely half as long. 

 Fruit about equaling the slender pedicels, moderate, about 6 mm. 

 in diameter. Seed 2 mm. in diameter.- — PI. ly. 



Mexico? Known only from the unpublished figures of Sese and 

 Mogiho and Node-veran, which AI. de Candolle has placed in my 

 hands for study, and of which he has furnished for publication an 

 excellent photographic copy. 



Leaves relatively or actually thin, 15-40 mm. \vide, serrulate-scabrous, not 

 usually brush-like at tip. Inflorescence ample, often peduncled, com- 

 pound-panicled or occasionally decompound. Bracts usually dilated 

 and papery, often showy. Bractlets flmbriate-lacerate, conspicuous. 

 Fruit large, inflated, the seed not protruded. Trees (with one excep- 

 tion?) (pp. 422-426). Arborescentes^ 

 Leaves rather thick, little shredded at tip. Pedicels scarcely half as long 

 as the fruit. 



N. Parryi Watson, Proc. Amer. Acad. 14: 247. 1879. 



Trunk 1-2 m. high. Leaves almost pungent, rather thick, con- 

 cave, keeled, 15-25 or ev^en 35 mm. wide, serrulate- 

 scabrous. Inflorescence with rather narrow divisions 

 15-30 cm. long and spreading densely flowered 

 branchlets scarcely 4 cm. long. Flowers large, with 

 perianth segments 4 mm. long. Fruit very large, 

 orbicular, deeply notched at both ends, 12-15 "'"'•i- i" diameter. 

 Seed 3X4 mm. — PI. 5, 12. 



Colorado desert. In the region with A'. Bigclovii. 



Specimens examined : California. Desert east of San Ber- 

 nardino {Parry, 1876, — the tyjic). Whitewater {Vascy, 1881, — 



