A Karyological Survey of Asclepiadoideae, Periplocoideae, and Secamonoideae, and Evolutionary Considerations within Apocynaceae s.l.

The phylogeny of Monsonia L. (Geraniaceae)

“…The East African land bridge may be interrupted at present, but a north-south corridor has been postulated on several occasions (Winterbottom 1997). Southern Africa became a secondary species centre for the genus, as seen in several other taxa (Albers and Meve 2001). Herbaceous species like M. glauca, M. angustifolia and M. senegalensis could have spread into this area, while new species could have developed since and are now endemic to the region.…”

Karyomorphological Studies in Wrightia tomentosa and W. tinctoria; Multipurpose Tree Species of Aravallis in South-East Rajasthan

“…Thus the basic number is reported to be xϭ11 and 10 confirming the previous reports available for various genera in this family. Besides xϭ10 and 11,xϭ6,8,9,12,16,18,20,21 and 23 have also been reported in this family (Laan and Arends 1985, Albers et al 1993, Albers and Meve 2001. Of these xϭ11 is considered to be primitive (Laan and Arends 1985), occurring in ca.…”

A morphological, karyological and chemical study of the Apteranthes (Caralluma) europaea complex

“…This is the standard situation in Asclepiadoideae, where c . 96% of the investigated taxa have a basic chromosome number of x = 11, and over 90% are euploid diploids (Albers & Meve, 2001). Karyotype analysis revealed a homogeneous genome of predominantly meta‐ to submetacentric chromosomes for A. europaea .…”

“…In addition, it represents one of the very few hexaploid species in Asclepiadoideae (cf. Reese & Kressel, 1967; Raynaud, 1991; Albers & Meve, 2001), in contrast to the always diploid A. europaea (as demonstrated below).…”