Rvi)i;i:k(; : Studies on the Rocky Mountain Floka 088 



which enlarges somewhat in fruit but does not become membra- 

 nous : llowers in each invohicre 3 : jjerianth open, short fuiuiel- 

 form : stamens 3, distinct : fruit cHipsoid, neither anj^led nor ribbed, 

 very indistinctly tuberclcd, <jlabrous. 

 Only one species. 



I. Allioniella oxybaphoides (A. Cray) 

 Qitauioclidioii oxybaphoidis A. (jray, Am. Journ. Sc. II. 15: 



320. 1853. 



Mirabilis oxybaplioiihs A. Gray, Bot. Mex. Bound. Surv. 173. 



1859. 



OxybapJius jr/vV///// Hemsl. Biol. Cent. Am. 3: 3. 1882. 



Allionia oxybaphoides Kuntzc, Rev. Gen. 533. 1891. 



From the many synonyms can be seen that this species has 

 been moved from one genus to another. Most botanists have 

 regarded it as an Al/io?iia {Oxybaplnis), which it resembles most in 

 general habit, the perianth and the number of stamens ; but it 

 lacks the most essential characters of that genus, viz., the ribbed 

 fruit and the membranous involucre. It is, therefore, more clo.sely 

 related to the Mirabilis series ; and could be included in genus 

 Qiiamoclidion had it not the open AUionia-X\V& perianth, only three 

 stamens and a flat rotate involucre. It is, therefore, better to regard 

 it as the type of a new genus, intermediate between Allionia and 

 Qiiamoclidion. 



A. oxybaphoides grows from southern Colorado to western 

 Texas and Arizona ; also in northern Mexico. 



5. ALLIONIA Loefl. It. Hisp. 181. 1758 



Vitmania Turra; Cav. Ic. 3 : 53. 1794- Not Vitmaunia 

 Vahl. 1 794. 



Oxybaphus L'Her.; Willd. Sp. PI. i : 185. 1797. 



Calyxhymcnia Ortega, Nov. aut Rar. PI. Hort. Matr. 5. 1797. 



Calymcnia Pers. Syn. i : 36. 1805. 



The genus was based on a plant which a year later received 

 the specific name A. violacca L. Vitmania and OxybapJius were 

 both based on Mirabilis viscosa Cav.; Calyxhymcnia on C. glabri- 

 folia and Calymcnia on six species without the type being desig- 

 nated. 



