RvDiJERG : Studies on the Rocky Mountain Flora 692 



blades glabrous, thickish, linear to linear-lanceolate, acute, 5-10 

 cm. long: involucres numerous, in terminal cymes about 1.5 cm. 

 wide, cleft below the middle into elliptical or oval obtuse lobes : 

 perianth pink, about 8 mm. wide : fruit oblong-obovoid, slightly 

 compressed, bluntly angled and not strongly tubercled, strigose. 



Perhaps closest related to A. linearis, but distinguished by 

 the thinner divergent leaves, the form of the involucre and the 

 fruit. 



Colorado: Durango, 1898, Baker, Earle & Tiaey, 312 (type 

 in herb. N. Y. Bot. Garden). 



Arizona: Bakers Butte, Mogollon Mountains, 1887, Mearns, 

 -53- 



11. Allionia ACiGREGATA (Ortega) Spreng. Syst. i: 384. 1825 



CalyxJiymeiiia aggregata Ortega, Nov. aut Rar. PI. 8 : //. //. 

 1798 (or 1799^). 



Oxybaplms aggregatiis Vahl, Enum. 2 : 41, in part. 1806. 



This is not the plant named 0. aggregatus by Torrey, Watson 

 and others, from Arizona and northern Mexico, but one that is 

 closely related to A. Jiirsuta and generally has been confused with 

 it. It differs mainly in the axillary solitary peduncles and in this 

 respect is analogous \.o A. Bodinii. Vahl evidently had two plants 

 confused, citing as synonyms CalyxJiynienia aggregata Ortega and 

 Mirabilis aggregata Cavanilles, both illustrated and closely related 

 species of Allionia. Ortega's plant, which was the first published,* 

 is densely hirsute, while Cavanilles' plant is glabrous. Vahl, in 

 his diagnosis, describes it as glabrous but remarks in parentheses 

 " according to Ortega hirsute." 



A. aggregata grows in dry soil from Wisconsin to Texas and 

 New Mexico, also in northern Mexico. 



12. Allionia decumbens (Nutt.) Spreng. Syst. i: 384. 1825 



Mirabilis aggregata Cav. Ic. 5 : 22. //. 43 J. 1799- 

 Oxybaplms aggregatus Vahl, /. e. in part. 

 Calynienia decuuibens ^\xVi. Gen. i: 26. 18 18. 

 Oxybaplms deeunibens Sweet, Hort. Brit. I: 334. 1826. 



* I have not been able to find the exact date of Ortega's fascicle in which the de- 

 scription appears. The ten fascicles were published in 1797-1800; but Cavanilles cites 

 Ortega, which indicates that the latter's description was published first. 



