Pilar:
De acuerdo en algunas con los muchachos...
creo que serrano me abrio bien los ojos...
La primera si que parece christinae....
ahora se denomina
Rebutia steinmannii christinae
aqui la descripcion del Pilbeam a ver que dices:
'christinae' Rausch, Kakt.u.a.sukk. 26(7):145 with fig. (1975) -as Rebutia christinae; Lobivia 85:129,152 (1987) -as Lobivia steinmannii var. christinae ; CITES Cact. Checklist 124 (1992) = R. pygmaea
This is a striking, densely, yellow spined variant, making a low clustering plant in cultivation, somewhat lower in aspect than most other varieties. The CITES Cactaceae Checklist referral to R. pygmaea is not understood. It is described as solitary in the wild (as indicated it clusters ill cultivation), globose, to 25mm in diameter, with clear green body colour. and thick roots. There are 12 or 13 ribs, straight to slightly twisting, with oval areoles, white to dark brown woolled. The 14 to 16 interlacing radial spines are glassy white to pale yellow, to 7mm long, thickened and brown at base. There is one central spine, to 5mm long, pale yellow, the base. thickened and dark brown, also dark brown at the tips of the spine:; Flowers are orange, the exterior of the petals pink with whitish-green midstripe, 3cm long and wide. Reported from Argentina, Salta, between Nazareno and Rodeo, at 3,5001l1 (11,500ft) altitude.
Que tal???
La segunda me parece mas una
Rebutia albiaerolata
La 3ra y 4ta ahora se denominan:
Rebutia canigueralii rauschii Y tienes las dos formas verde y violeta.
Espero haberte ayudado
Saludos