|Snijman, Deirdre - COMPTON HERBARIUM|
Submitted to: Botanical Society of America Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: March 15, 2000
Publication Date: N/A
Technical Abstract: Tribe Amaryllideae of the Amaryllidaceae is endemic to Africa with the exception of the pantropical Crinum. It is sister to the rest of the family in trees generated by plastid sequences. We present the results of cladistic analyses of nrDNA ITS sequences for 30 species representing all genera of the tribe, using Scadoxus puniceus as outgroup. Six trees are found with equal weights imposed on the data, three with successive weighting. The consensus trees of both analyses are identical. Boophane is unresolved in relation to the rest of the tribe, which may be due to the outgroup used. Agapanthus is the preferred outgroup for this analysis, but we have been unable to obtain ITS sequences for any Agapanthus sp. Amaryllis is sister to all of the other genera, which form two clades conforming to Snijman and Linder's subtribes Amaryllidinae (less Boophane) and Crininae (less Amaryllis). Crossyne is the first branch of the Amaryllidinae, within which Hessea (less H. bruce-bayeri) is resolved as sister to Brunsvigia. Strumaria is monophyletic only if Carpolyza is treated as a Strumaria or several species are transferred to Carpolyza, and Hessea bruce-bayeri is transfered to Strumaria. Nerine is sister to Strumaria. Within Crineae, Ammocharis,Cybistetes, and Crinum baumii form a sister clade to an otherwise monophyletic Crinum. The results are contrasted with Snijman and Linder's cladistic analysis based on morphological data, with which the gene trees are only partially congruent.