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Inflorescence morphology and flower development in Pinguicula alpina and P. vulgaris (Lentibulariaceae: Lamiales): monosymmetric flowers are always lateral and occurrence of early sympetaly

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Organisms Diversity & Evolution : Volume 12, Issue 1, March 2012

Organisms Diversity & Evolution : Volume 11

Organisms Diversity & Evolution : Volume 10

Inflorescence morphology and flower development in Pinguicula alpina and P. vulgaris (Lentibulariaceae: Lamiales): monosymmetric flowers are always lateral and occurrence of early sympetaly

Content Provider	Springer Nature Link
Author	Degtjareva, Galina V. Sokoloff, Dmitry D.
Copyright Year	2012
Abstract	Earlier interpretations of shoot morphology and flower position in Pinguicula are controversial, and data on flower development in Lentibulariaceae are scarce. We present scanning electron microscopy about the vegetative shoot, inflorescence and flower development in Pinguicula alpina and P. vulgaris. Analysis of original data and the available literature leads to the conclusion that the general pattern of shoot branching and inflorescence structure is uniform in all the Pinguicula species studied so far. The inflorescence is a sessile terminal umbel that is sometimes reduced to a solitary pseudoterminal flower. Flower-subtending bracts are either cryptic or present as tiny scales. A next order lateral shoot develops in the axil of the uppermost leaf, below the umbel. It is usually though not always homodromous, i.e., the direction of the phyllotaxy spiral is the same as in the main shoot. Among Pinguicula species that overwinter as a hibernaculum, the initiation of floral organs takes place in the same year as flowering in P. vulgaris, and 1 year earlier in P. alpina. Early congenital petal fusion (‘early’ sympetaly) is documented in Pinguicula, though most other members of Lamiales exhibit ‘late’ sympetaly. Sporadic occurrence of rudiments of two posterior stamens in Pinguicula is confirmed. A speculation is made that, in angiosperms, monosymmetric flowers cannot be terminal on shoots bearing more than two (or three) phyllomes.
Starting Page	99
Ending Page	111
Page Count	13
File Format	PDF
ISSN	14396092
Journal	Organisms Diversity & Evolution
Volume Number	12
Issue Number	2
e-ISSN	16181077
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-02-20
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Calyx aestivation Congenital fusion Development Flower Inflorescence Lamiales Lentibulariaceae Morphology Phyllotaxy Pinguicula Sympetaly Plant Systematics/Taxonomy/Biogeography Evolutionary Biology Biodiversity Animal Systematics/Taxonomy/Biogeography Developmental Biology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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Inflorescence morphology and flower development in Pinguicula alpina and P. vulgaris (Lentibulariaceae: Lamiales): monosymmetric flowers are always lateral and occurrence of early sympetaly