CONTRIBUTIONS TO WESTERN BOTANY NO. 16 



(?). East of Blythe in Arizona. Seeptember 16, 1929. No. 24878. 

 Same form. Quartzite, Arizona. September 16, 1929. 



Euphorbia hirtula (?). No. 24879. East of Desert Center, California. 

 September 16, 1929. 



Euphorbia setiloba. No. 24880. Quartzite, Arizona. Seeptember 16, 1929. 



Dalea angulata N. Sp. No. 24881. This would come in Rydberg's genus 

 Thornbera. A woody perennial, herbaceous above, and with the habit 

 of Parryella, with ascending stems two feet long and filiform and 

 freely branching, ashy throughout with appressed white hairs, the calyx 

 silvery. Leaves 1-2 inches long, on a petiole hardly longer than the 

 lowest leaflet, with 6-10 pairs of oval-obovate and emarginate and 

 thickish leaflets about 2 mm. long, which are smooth above and nearly 

 contiguous, but ciliate on the margins and hairy on the back. Racemes 

 2-4 inches long on a slender petiole, with 10-20 ascending flowers 

 appearing as if spicate at first, but with a minute pedicel which is 

 glandular. Lanceolate bracts as long as calyx tube and deciduous. 

 Calyx about 3 mm. long, almost deltoid in longitudinal section, with 

 10 conspicuous ribs and gland-bearing furrows between but with no 

 exudate, the triangular calyx teeth about as long as the tube. Petals 

 purple, about 1 mm. longer than the calyx. Growing among rocks at 

 low elevations on the Baboquivori mountains, Arizona. September 

 22, 1929. 



13, 1929. 

 Astragalus Parishii. No. 24883. Arrowhead Lake, California. August 



Muhlenbergia Porteri. No. 24730. Baboquivori mountains, Arizona. Sep- 

 tember 19, 1929. 



Muhlenbergia monticola. No. 24731. Ramsey Canon, Huachuca moun- 

 tains, Arizona. September 28, 1929. 



Aristida divaricata. No. 24732. Ajo, Arizona. No. 24733. Baboqui- 

 vori mountains, Arizona. September 19, 1929. 



Aristida Scheideana. No. 24733. Baboquivori mountains, Arizona. Sep- 

 tember 19, 1929. No. 24734. Ramsey Canon, Huachuca mountains, 

 Arizona. September 30, 1929. 



Chloris elegans. No. 24735. Ajo, Arizona. September 18, 1929. Acting 

 like introduced. 



r.picimpes distichophylla. Xo. 24736. Ramsey Canon, Huachuca moun- 

 tains, Arizona. September 30, 1929. No. 24737. Baboquivori moun- 

 tains. September 19, 1929. Common among rocks. 



I a^rustis lugens. No. 24738. Baboquivori mountains, Arizona. Septem- 

 ber 19, 1929. No. 24738. Ramsey Canon, Huachuca mountains, 

 Arizona. September 30, 1929. No. 24740. Miller Canon, Huachuca 

 mountains, Arizona. October 1, 1929. 



Eragrostis pilosa. No. 24741. Ramsey Canon, Huachuca mountains, 

 1929. 



