Mammillaria Forum

Discussion Forum about Mammillaria, Coryphantha and Escobaria
 
HomeHome  GalleryGallery  FAQFAQ  SearchSearch  RegisterRegister  Log in  

Share
 

 Mammillaria formosa vs Mammillaria sempervivi

Go down 
AuthorMessage
Lucio



Number of posts : 15
Location : Calabria, in the South of Italy
Registration date : 2009-01-26

Mammillaria formosa vs Mammillaria sempervivi Empty
PostSubject: Mammillaria formosa vs Mammillaria sempervivi   Mammillaria formosa vs Mammillaria sempervivi Icon_minitimeFri Feb 27, 2009 12:12 pm

Hi
Mammillaria sempervivi and Mammillaria formosa (specially som form of this) are very similar in the descriptions, How we can distinguish them?
I think the number of radial spines are important, but it is very variable! Neutral
Back to top Go down
View user profile
Chris43
Moderator
Moderator
Chris43

Number of posts : 1707
Age : 75
Location : Chinnor, UK
Registration date : 2008-07-16

Mammillaria formosa vs Mammillaria sempervivi Empty
PostSubject: Re: Mammillaria formosa vs Mammillaria sempervivi   Mammillaria formosa vs Mammillaria sempervivi Icon_minitimeFri Feb 27, 2009 4:55 pm

Hi Lucio,
I don't think they are so difficult to distinguish, especially when in flower.
M. sempervivi has very few radial spines and they soon drop off, leaving just 1 or 2 central spines. The flowers also are quite definitely yellow.
M. formosa and its various forms, always have persistent radial spines, usually 2 or more central spines, and pale pink to white flowers. The only plant that differs in M. pseudocrucigera, often stated to be a form of sempervivi, but this has pink striped flowers, though its spines are more like the proper sempervivi. Pilbeam says that ssp. pseudocrucigera is the link between formosa and sempervivi - I agree in spine formation, but not in terms of flower, which is much darker than any formosa form I have seen.
I have heard, but not seen, of an apparently true sempervivi which has pink flowers, but in many cases the plant turns out to be pseudocrucigera.

_________________
Chris43, moderator
Back to top Go down
View user profile http://www.woodedge.me.uk/index.html
 
Mammillaria formosa vs Mammillaria sempervivi
Back to top 
Page 1 of 1
 Similar topics
-
» Mammillaria formosa vs Mammillaria sempervivi
» Mammillaria formosa
» Mammillaria hernandezii
» RS 1318 aff.centricirra ?
» WANTED. M.brachytrichion

Permissions in this forum:You cannot reply to topics in this forum
Mammillaria Forum :: MAIN SECTION :: Identification-
Jump to: