Romulea
publication ID |
https://doi.org/ 10.5281/zenodo.5180119 |
persistent identifier |
https://treatment.plazi.org/id/03A7676A-FFF7-1E34-81C6-FB0A015388D8 |
treatment provided by |
Carolina |
scientific name |
Romulea |
status |
|
Relationships of Romulea View in CoL
Romulea View in CoL is usually believed to be most closely allied to Syringodea View in CoL because of their comparably reduced habit (all Syringodea species are acaulescent), branched inflorescences with actinomorphic flowers solitary on the branches and similar corms with woody tunics and a crescent-shaped basal ridge. There are, however, several fundamental differences between the two. The leaves of Syringodea View in CoL are bifacial and usually channeled (or sometimes terete) and lack the grooves characteristic of Romulea View in CoL ; the outer bracts in Syringodea View in CoL are tubular below through fusion of the lower margins; the style branches in Syringodea View in CoL are simple, unlike the divided style branches in Romulea View in CoL ; and the pollen in Syringodea View in CoL , like that of Crocus View in CoL but unlike other genera in Crocoideae , is inaperturate. In the absence of evidence to the contrary both Romulea View in CoL and Syringodea View in CoL are presumed to be allied to the genera Hesperantha View in CoL and Geissorhiza View in CoL in a clade defined by the actinomorphic flower (now believed to be derived within Crocoideae ) and the asymmetric corm with woody tunics. If this proposed phylogeny is correct, the grooved leaf, inner bracts with membranous margins and divided style branches are synapomorphies for Romulea View in CoL . The evidence for a relationship between Syringodea View in CoL and Romulea View in CoL , however, is weak at best, for a subterranean stem is not uncommon in the Iridaceae View in CoL and an inflorescence with flowers solitary on the branches is a feature of most acaulescent Crocoideae , including Duthieastrum , Ixia acaulis View in CoL and Crocus View in CoL . Moreover, chloroplast DNA sequence data do not strongly associate the two genera nor, in fact, point to any particular relationships for Romulea ( REEVES et al. 2000) View in CoL .
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
Kingdom |
|
Phylum |
|
Class |
|
Order |
|
Family |
Romulea
Manning, John C. & Goldblatt, Peter 2001 |
Ixia acaulis
Goldblatt & J.C.Manning 1993 |
Crocoideae
G.T.Burnett 1835 |
Crocoideae
G.T.Burnett 1835 |
Crocoideae
G.T.Burnett 1835 |