1034 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



ADDENDA 



The statement (see p. 1) that "there has never been a comprehensive 

 publication dealing with this extraordinarily interesting State flora," 

 although correct when written, is no longer so, "A flora of New Mexico 

 and Arizona," by Ivar Ticlestrom and Sister Teresita Kittell, having 

 been issued in 1941. 



Arrhenatherum elatius (L.) Presl, Fl. Cech. 17. 1819. 



Tall-oatgrass. This was collected recently near Flagstaff, Coconino 

 County (Whiting 1211). It is a tall grass with elongate narrow 

 panicles, cultivated and escaped here and there in North America,, 

 native of Europe. The genus is closely related to Avena (see p. 108) 

 but is distinguished by having the lower of the 2 florets staminate, 

 with a long geniculate awn, and the upper floret perfect, with a short 

 straight awn. 



Muhlenbergia appressa C. O. Goodding, Wash. Acad. Sci. Jour. 31: 

 504. 1941. 

 Gila, Pinal, Maricopa, and Graham Counties, 3,000 to 4,000 feet, 

 canyons and slopes, March and April. Known only from southern 

 Arizona. Closely related to M. microsperma (DC.) Kunth (see p. 

 115), differing in having narrow panicles with closely appressed 

 branches and longer spikelets, 4.5 to 6 mm. long. 



Muhlenbergia brevis C. O. Goodding, Wash. Acad. Sci. Jour. 31: 505. 

 1941. 

 Bowie, Cochise County, 3,760 feet, open ground, August to October. 

 Colorado and Texas to Arizona, south to the Federal District, Mexico. 

 This species is related to M. depauperata Scribn. (see p. 116), to which 

 specimens have been referred, but differs in having lemmas 4 to 5 mm. 

 long, awns 10 to 20 mm. long, and glumes much shorter than the 

 spikelet. 



Sporobolus patens Swallen, Wash. Acad. Sci. Jour. 31: 352. 1941. 



Wilcox, Cochise County (Silveus 3504, type); known only from the 

 type collection. A slender erect annual with short flat blades 1 to 

 2 cm. long and, rather delicate loosely flowered panicles with long- 

 pediceled spikelets 1.8 to 2 mm. long. 



Sporobolus pulvinatus Swallen, Wash. Acad. Sci. Jour. 31: 351. 1941. 

 Apache and Cochise Counties, 3,500 to 5,300 feet, open sandy plains 

 and roadsides. Texas to Arizona and northern Mexico. Specimens 

 of this species have been referred to S. pyramidatus (Lam.) Hitchc. 

 (see p. 122) but differ in being annual with short flat blades and in 

 having smaller spikelets of which the second glume and lemma are 

 abruptly acute or subobtuse. 



Cyperus pringlei Britton. Of the specimens identified by the writers 

 as of this species (see p. 160), Hugh O'Neill has referred several with 

 a condensed inflorescence to C. flavus (Vahl) Nees and others with an 

 open, long-rayed inflorescence to C. mutisii (H. B. K.) Griseb. The 

 latter species is distinguished by rather narrowly cylindric spikes 2 

 to 4 cm. long, and 1- to 3-flowered spikelets, these plump at maturity. 

 C. subambiguus var. pallidicolor Kukenthal is regarded by Father 

 O'Neill as not distinct from C. flavus. On the basis of these identifica- 

 tions, the known ranges of the 3 species in Arizona are: C. pringlei, 



