681 Rydberg : Studies on the Rocky Mountain Flora 



If interpreting the second case in a similar way, one would 

 come to the conclusion that OxybapJuts aggregates Vahl was pub- 

 lished in Vahl's Icones, if not in Sprengel's Icones ; but neither is 

 the case, for no book with that title was ever published by either 

 Vahl or Sprengel. From Mr. Jones' citation no one could imag- 

 ine that Ic. 5 437, stands for Cavanilles' Icones, where Mirabilis 

 aggregata appeared. This is not the earliest appearance of the 

 name aggregata, however, for this was originally published by 

 Ortega * as Calyxhymcnia aggregata. As Cavanilles' plant is differ- 

 ent from Ortega's, the former being Allionia decumbens (Nutt.) 

 Spreng., the latter A. agregata (Ortega) Spreng. as shown below, 

 Jones citation becomes not only unintelligible but also incorrect. 

 It would have been much better to leave out the citation of pubh- 

 cations altogether, which by the way is advisable for anyone who 

 does not possess good library facilities. 



Key to ttie Genera of tlie Rncky mountain Region 



Bracts distinct. 



Fruit crested or winged ; bracts in a whorl at the base of the head-like cluster ; 



perianth salverform. I. Abronia. 



Fruit globular, neither crested nor winged ; bracts attached each to a pedicel of the 

 umbel-like or corymbose inflorescence ; perianth funnelform. 2. Hertnidium. 

 Bracts united. 



Fruit neither strongly tubercled nor winged. 



Fruit not ribbed ; involucre herbaceous, little if any enlarging in fruit, not be- 

 coming membranous. 

 Stamens usually 5 ; involucres campanulate, not enlarged in fruit. 



3. Quamoclidion. 

 Stamens 3 ; involucre rotate, somewhat enlarged in fruit in the manner 

 of the next genus, but not membranous. 4. Allioni4la. 



Fruit ribbed ; involucre rotate, in fruit becoming much enlarged and mem- 

 branous. 5. Allionia. 

 Fruit with two rows of strong tubercles on the back and surrounded by two toothed 

 inflexed wings. 6. Wedelia. 



I. ABRONIA Juss. Gen. 448. 1789 



Tricratus L'Her. ; Willd. Sp. PI. i : 807. 1799. 



Cycloptera Nutt.; Gray, Am. Jour. Sc. II. 15: 319. 1853. 



In the original publication, no type species was mentioned. 

 The genus was described from a plant collected on De la Peirouse's 

 journey in California and cultivated by Mr. Colignon. Hooker in 



* Nov. aut Rar. PI. 8 : //. //. 1798 (or 9?). 



