The Families of Flowering Plants :: essays research papers

family Asphodelaceae(Aloe Family)CLASSIFICATIONDahlgren et al. (1985) divided the Monocotyledons into several superorders of which the Liliiflorae is the largest. The order Asparagales is the largest of the five orders within Liliiflorea. angiotensin converting enzyme of the families within Asparagales recognized by Dahlgren and his co-workers was Asphodelaceae (Chase et al. (2000). Asphodelaceae consists of the sub-families, the Asphodeloideae and the Alooideae. The Alooideae consists of six genera of which Aloe is the largest. The sub-family Alooideae argon noted for their spectacular secondary growth, a characteristic used to rig the Alooideae as monophyletic. On the other hand, some workers within the taxa have considered the preceding(prenominal) two subfamilies were for sometime, considered to be separate families, the Asphodelaceae and Alooideae (Dagne and Yenesaw 1994). Determining the proper evolution was difficult because some authors have argued that Aspodeloideae is not a monophyletic group. Also, the Aspodeloideae ar much varied and share a great deal of morphological similarities amongst other groups (Chase et al. 2000). The latest generation of chemical information on species be to these two groups is believed to reveal the relationships among the various taxa and to assist in establishing taxonomic classifications at various levels (Dagne and Yenesaw 1994). However, there is still not strong enough record suggesting both sub-families should not be included in a whizz family, the Asphodelaceae (Bisrata 2000). MORPHOLOGYAsphodelaceae is a apparent family from other liliod liliopsid groups by a combination of several morphological and reproductive features coinciding microsporogensis, atypical ovular structure, lacking steroidal saponins, producing seeds with arils, and the general presence of anthraquinones. canonical morphological features of genera within the Asphodelaceae consist of mostly herbs, shrubs, and sometimes arborescent, which grows into beechen forms with trunks that can grow up to several meters high. The leaves are system is alternate, spiral or 2-ranked that usually form rosettes at base or ends of the branches. The leaves are often thick and succulent with parallel venation. The succulent aloes vary in size and morphology from the dwarf rosettes (Adams et al. 2000). Vascular bundles are arranged in rings around mucilaginous parenchyma tissue, the bundles have parenchymatous aloin cells in inner bundle sheath near the phloem poles. The association of aloin cells and primal gelatinous zones are synapomorphic for species with Alooideae (Judd et al. 1999). The perianth is usually bisexual and showy, with 6 unambiguous to strongly connate, non-spotted tepals. Reproductive flower parts have 6 distinct stamens and 3 connate carpels and a superior ovary that contain nectaries in septa.