Rydberg: Notes on Rosaceae 321 



that the two supposed species are identical, and that Lachemilla 

 orbiculata ranges from Central Mexico to Bolivia. 



The rest of the North American species except L. ocreata 

 resemble Aphanes more strongly in habit and leaves, but they are 

 all perennials. 



Lachemilla procumbens (Rose) Rydb. is perhaps the most 

 common of the Mexican species. Specimens of it are usually 

 labeled Alchemilla sibbaldiaefolia HBK. [Humboldt, Bonpland 

 & Kunth's figure* shows that the original A. sibbaldiaefolia has 

 different hypanthium, inflorescence and leaves, the latter in fact 

 less like those of Sibbaldia procumbens than those of L. procumbens 

 are. 



Lachemilla domingensis (Urb.) Rydb. was based wholly on the 

 description of Alchemilla domingensis Urb., no specimens of any 

 Lachemilla having been seen from the West Indies at that time. 

 Long after the publication of that part of the North American 

 Flora containing Lachemilla, the first specimens were seen, but 

 both the place in the key and the description were found to be 

 correct and nothing needs to be added. 



The following species were proposed as new: Lachemilla Schie- 

 deana Rydb., L. Pringlei Rydb., L. orizabensis Rydb., and L. 

 Bonrgeaui Rydb. The first two were based in part on Alchemilla 

 hirsuta campestris Cham. & Schlecht., which was described from a 

 mixture. 



Lachemilla ocreata (Donn. Smith) Rydb. is a very peculiar 

 plant, apparently leafless, the leaves being reduced to connate 

 imbricate sheaths, cleft into linear divisions. It is closely related 

 to the South American Alchemilla nivalis. 



ZYGALCHEMILLA 



This genus was based on Alchemilla pinnata R. &. P., which 

 has pinnate instead of palmately lobed leaves, as all the other 

 species of the tribe have. This character, as well as the 3-nerved 

 sepals and bractlets, constitutes^the basis for the generic segre- 

 gation. A rather interesting fact in its history may be recorded. 

 Remyf described a supposed new species as Alchemilla pinnata, but 

 finding that the name was preoccupied by A. pinnata R. &. P., 



* Nov. Gen. & Sp. 6: pi. 561. 



t Ann. Sci. Nat. Bot. III. 6: 354. 1846. 



