A Descriptive List of Species of the Genus Heuchera. 



r>v \Vm. E. Wheei.ock. 



The genus is accepted as defined by Bentham and Hooker, 

 Gen. PL i. 638. 



The description of the calyx given below, including its dimen- 

 sions, refers in every case to the calyx at the time of flowering ; 

 the fruiting calyx being, as a rule, much larger and quite differ- 

 ent in form. 



i$ I. Stamens exserted sooner or later. 



f Flowering calyx i" to i^" long. 



* Inflorescence loosely paniculate or cymose-paniculate. 



1 . //. Rugelii. 



2. //. glabra. 



3. //. 7nicraniha. 



4. //. villosa. 



*" Inflorescence cymose-subspicate. 



5. H. uiinntiflora. 



*** Inflorescence a long, narrow panicle ; flowers clustered. 



6. II. pilosissima. 



\\ Flowering calyx i^'^" to 3" long. 



* Inflorescence a large, densely flowered, narrow thyrsus. 



7. H. maxima. , 

 ** Inflorescence paniculate or cymose-paniculate. 



8. //. Americana. 



9. //. longipt'tala . 

 ID. H. Orizabensis. 



11. //. riibcscciis. 



*** Inflorescence glomerate-spicate, often secund. 



12. H. brae teat a. 



(II Flowering calyx 3" to 5" long. 



* Inflorescence an open, spreading panicle. 



13. II. piibescens. 



** Inflorescence a narrow panicle. 



14. //. hispida. 



