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RypBERG.: STUDIES ON THE Rocky Mountatn Frora 681 
If interpreting the second case in a similar way, one would 
come to the conclusion that Oxybaphus aggregatus 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 paki ad 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 Calyxhymenia aggregata. As Cavanilles’ plant is differ- 
ent from Ortega’s, the former being Adlionia decumbens (Nutt.) 
Spreng., the latter 4. 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 publi- 
cations altogether, which by the way is advisable for anyone who 
does not possess good library facilities. 
Key to the Genera of the Rocky Mountain Region 
Bracts distinct. 
Fruit crested or winged ; bracts in a whorl at the base of the head-like cluster ; 
perianth salverform. x. Abronia, 
Fruit globular, neither crested nor winged ; bracts attached each to a pedicel of the 
umbel-like or corymbose inflorescence ; perianth funnelform. 2. Hermidium. 
Bracts united. 
Fruit neither strongly tubercled nor or 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. QOuamoclidion. 
Stamens 3; involucre rotate, somewhat enlarged in fruit in the manner 
of the next genus, but not membranous. 4. Altioniella. 
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. 
ABRONIA Juss. Gen. 448. 1789 
_ Tricratus L) Her. ; Willd. Sp. Pl. 1: 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. Pl. 8: f/. rz. 1798 (or 9?)- 
