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However, in Tubocapsicum, where corolla and adnate filaments are appressed to the ovary, there are grooves between the filaments that permit nectar release. Such grooves are also found in Aureliana, Withania and perhaps other genera, but not in the species of Capsicum that we examined.
Tubocapsicum differs conspicuously from other members of the Solanoideae in the adnation of its filaments to the corolla limb.
Tubocapsicum differs conspicuously from Capsicum in lacking giant cells of the ovary as reported by Fridvalsky & Nagy (1966). In their analysis of chloroplast DNA, Olmstead et al. (1999) found Tubocapsicum, Withania, and Aureliana associated on a clade well separated from others in their inferred phylogeny of the family.
Es ist unwahrscheinlich, dass Tubocapsicum wirklich ein prähistorischer Vorfahre von Capsicum ist.
Es gibt zwar Gemeinsamkeiten, z.B. im Aussehen der Pflanzen zu Capsicum, aber auch deutliche Unterschiede, die nahelegen dass Tubocapsicum und Capsicum nicht eng verwandt sind, sondern eine nähere genetische Verwandtschaft von Tubocapsicum zu anderen Gattungen (Withania, Aureliana) der Familie der Nachtschattengewächse besteht.
http://ejournal.sinica.edu.tw/bbas/content/2001/1/bot421-10.pdf - Kapitel "Discussion, Relationships"