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54 results for “Linaceae”
Linum usitatissimum (Linaceae) - stem - showing leaf bases
Image of Linum usitatissimum (Linaceae) - stem - showing leaf bases
Linum usitatissimum (Linaceae) - leaf - on upper stem
Image of Linum usitatissimum (Linaceae) - leaf - on upper stem
Linum usitatissimum (Linaceae) - inflorescence - lateral view of flower
Image of Linum usitatissimum (Linaceae) - inflorescence - lateral view of flower
Linum usitatissimum (Linaceae) - inflorescence - closeup of flower interior
Image of Linum usitatissimum (Linaceae) - inflorescence - closeup of flower interior
Linum usitatissimum (Linaceae) - fruit - lateral or general close-up
Image of Linum usitatissimum (Linaceae) - fruit - lateral or general close-up
Linum usitatissimum (Linaceae) - inflorescence - frontal view of flower
Image of Linum usitatissimum (Linaceae) - inflorescence - frontal view of flower
Linum usitatissimum (Linaceae) - inflorescence - whole - unspecified
Image of Linum usitatissimum (Linaceae) - inflorescence - whole - unspecified
Linum usitatissimum (Linaceae) - whole plant - in flower - general view
Image of Linum usitatissimum (Linaceae) - whole plant - in flower - general view
Linum sulcatum (Linaceae) - stem - showing leaf bases
Image of Linum sulcatum (Linaceae) - stem - showing leaf bases
Linum sulcatum (Linaceae) - inflorescence - frontal view of flower
Image of Linum sulcatum (Linaceae) - inflorescence - frontal view of flower
Linum sulcatum (Linaceae) - fruit - lateral or general close-up
Image of Linum sulcatum (Linaceae) - fruit - lateral or general close-up
Sources of variation in reciprocal herkogamy in the distyly floral syndrome of Linum tenue (Linaceae)
<p>Distyly is a floral polymorphism involving reciprocal herkogamy shaped by selection for pollen transfer efficiency. The variation of the floral organs involved in pollen transfer can be individually affected by environmental and genetic sources of variance, but the organ development will be canalized to minimize reciprocal inaccuracy between anthers and stigmas, as this is the focus of selection. We measured floral organ and cell length of both morphs of distylous <em>Linum tenue</em> (Linaceae) at different developmental stages of field- and glasshouse-grown plants. We analyzed the results to measure reciprocal inaccuracy and identify sources of variance.</p>
Nectar robbing by bees affects the reproductive fitness of the distylous plant Tirpitzia sinensis (Linaceae)
<p><span>Nectar robbing can affect plant reproductive success directly by influencing female and male fitness, and indirectly by affecting pollinator behavior. Flowers have morphological and chemical features that may protect them from nectar robbers. Previous studies on nectar robbing have focused mainly on homotypic plants. It remains unclear how nectar robbing affects the reproductive success of distylous plants, and whether defense strategies of two morphs are different. Nectar robbing rates on the long- and short- styled morph (L-morph, S-morph) of the distylous <em>Tirpitzia sinensis</em> were investigated. We compared floral traits, the temporal pattern of change in nectar volume and sugar concentration, nectar secondary metabolites and sugar composition between robbed and unrobbed flowers of two morphs. We tested direct effects of nectar robbing on female and male components of plant fitness and the indirect effects of nectar robbing via pollinators. Nectar robbing rates did not differ between the two morphs. Flowers with smaller sepals and petals were more easily robbed. The floral tube diameter and thickness were greater in L-morphs than in S-morphs, and the nectar rob holes were significantly smaller in L-morphs than in S-morphs. Nectar robbing significantly decreased nectar replenishment rate but did not affect nectar sugar concentration or sugar composition. After robbery the quantities and diversity of secondary compounds in the nectar of S-morphs increased significantly and the total relative contents of secondary compounds in L-morphs showed no obvious changes. Nectar robbing could decrease female fitness by decreasing pollen germination and thus decreasing seed set. Nectar robbing had no significant effects on male fitness. Robbed flowers were less likely to be visited by hawkmoth pollinators, especially in S-morphs. These results suggest that nectar robbing could directly and indirectly decrease the female fitness of <em>T. sinensis</em>, and different morphs have evolved different defense mechanisms in response to nectar robbing pressure.</span></p>
Nectar robbing by bees affects the reproductive fitness of the distylous plant Tirpitzia sinensis (Linaceae)
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Sources of variation in reciprocal herkogamy in the distyly floral syndrome of Linum tenue (Linaceae)
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FIGURE 4 in Tirpitzia meiguensis (Linaceae), a new species from southwest Sichuan (China)
FIGURE 4. Bayesian phylogenetic tree related to Tirpitzia including T. meiguensis based on ITS sequences, the lengths of branches indicate the rates of nucleotide substitution, and the posterior probabilities are shown beside the branches.
FIGURE 3 in Tirpitzia meiguensis (Linaceae), a new species from southwest Sichuan (China)
FIGURE 3. Photographs of living or re-watered Tirpitzia meiguensis D.J.Xie & R.B.Zhang, sp. nov. A. Habitat; B. Plant; C. Root; D. Flower; E. Fruit; F. Leaf margin; G. Bract; H. Bracteoles; I. Stipule; J. Floral segregation; K. Opened corolla; L. Filament tube and staminodes; M. Capsule; N. Seeds. Photographed by Da-Jun Xie, Shu-Ming Peng & Ren-Bo Zhang.
FIGURE 2 in Tirpitzia meiguensis (Linaceae), a new species from southwest Sichuan (China)
FIGURE 2. Line drawing of Tirpitzia meiguensis D.J.Xie & R.B.Zhang, sp. nov. A. Habit; B. Leaf; C. Bract; D. Flower; E. Pistil; F. Stamens; G. Opened stamens; H. Sepals; I. Stipule; J. Ovary cross section; K. Seed. Drawn by Tan Deng.
FIGURE 1 in Tirpitzia meiguensis (Linaceae), a new species from southwest Sichuan (China)
FIGURE 1. Transitional stem leaves and bracts of the newly discovered species in this study. A–D. Stem leaves are gradually transformed into bracts beneath a terminal simple flower (a) moving upwards a secondary branch; E. Upper simple flowers (b) are axil; F. Bracts (c) aggregated beneath sepals (d) and no stem leaves below. Scale bars: the smallest grid of the rulers is 1 mm. Photos by Da-Jun Xie & RenBo Zhang.
Linum medium var. texanum (Linaceae) - leaf - on upper stem
Image of Linum medium var. texanum (Linaceae) - leaf - on upper stem
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