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  • 1
    Electronic Resource
    Electronic Resource
    Dimorphic exine sculpturing in two distylous species ofDyerophytum (Plumbaginaceae) (1986)
    Springer
    Plant systematics and evolution 152 (1986), S. 267-276 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Plumbaginaceae Dyerophytum africanum ; D. indicum ; Ceratostigma abyssinicum ; Linum ; Distyly ; dimorphic pollen ; exine sculpturing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Light and SEM observations on the pollen ofDyerophytum africanum andD. indicum have revealed marked differences in exine features. These distylous species also have dimorphic pollen. In the short-styled individuals of both species, the sexine and nexine are of equal thickness, and the clava-like sexinous processes are short without marked projections. In the long-styled individuals, the sexine is thicker than the nexine, the clavae are higher than broad with an apical spinule. Pollen size and apertures are identical in both morphs. — Palynological evidence is presented for relationships betweenDyerophytum andCeratostigma, Plumbago andAegialitis. Moreover, the genusDyerophytum exhibits pollen morphological similarities with some species ofLinum (Linaceae).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00989432
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  • 2
    Electronic Resource
    Electronic Resource
    The pollination syndrome ofDeplanchea tetraphylla (Bignoniaceae) (1986)
    Springer
    Plant systematics and evolution 154 (1986), S. 237-250 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Bignoniaceae ; Deplanchea ; Morphology ; inflorescence ; flower ; nectar ; pollination ; evolution ; Flora of Malesia ; Australia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The reproductive structures ofDeplanchea tetraphylla (Bignoniaceae) exhibit a significant number of unusual features: inflorescence with an apical “platform”; flowers yellow, short-tubed, strongly zygomorphic; mouth closed through lateral compression; stamens and style long-exserted, erect or slightly reclined; nectar dark brown, exposed in the spoon-shaped lowermost corolla lobe and apparently acting also as a visual cue. These features suggest a highly elaborate syndrome for bird pollination: the birds (probably lorikeets) perch on the inflorescence platform and bend downwards to take up the exposed nectar, thus touching the exserted anthers and stigmas with the throat or breast. The likely evolution of this syndrome by additive steps, effecting a change from “head up” to “head down” position of the pollinator, can be traced from the floral structure of the remaining four species of the genus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00990126
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  • 3
    Electronic Resource
    Electronic Resource
    Evolution of the secondary haustoria to a primary haustorium in the parasiticScrophulariaceae/Orobanchaceae (1987)
    Springer
    Plant systematics and evolution 156 (1987), S. 127-131 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Scrophulariaceae ; Orobanchaceae ; Lesquereuxia = Siphonostegia syriaca ; Parasitism ; secondary haustoria ; primary haustorium ; apical meristem ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the parasiticScrophulariaceae andOrobanchaceae, two types of contact organs exist: secondary and primary haustoria. Secondary haustoria are lateral organs, developing in large numbers and only when the seedling is fully established. In contrast, a primary haustorium represents the first developmental stage of the seedling itself. In the root system of the parasiticLesquereuxia syriaca (=Siphonostegia syriaca) there are only secondary haustoria, but a few of them apparently develop in a terminal position. This is achieved by transferring the haustorial initiation region closer to the root apex. One can interpret this as a transformation of the apical meristem into a meristematic haustorial tissue. On the condition that an extreme shortening (abbrevation) of the primary root could happen, we discuss the transformation of the terminal secondary into a primary haustorium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00936067
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  • 4
    Electronic Resource
    Electronic Resource
    Two new species ofPhyllagathis related toP. tuberculata (Melastomataceae) from Peninsular Malaysia (1987)
    Springer
    Plant systematics and evolution 157 (1987), S. 187-199 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Melastomataceae ; Phyllagathis ; Taxonomy ; inflorescence and floral morphology ; Flora of Malesia and Malaysia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phyllagathis tuberculata King and two closely allied new species,P. magnifica A. Weber andP. stonei A. Weber, are described and illustrated. Within the genus, these species form a distinct and isolated group which is restricted to Peninsular Malaysia.P. tuberculata occurs in Perak (probably confined to G. Bujang Melaka),P. magnifica andP. stonei are found in the mountains on the Pahang/Selangor border (Genting Highlands, Gombak valley). The distinctive characters of the three species are listed and some general information relating to inflorescence morphology, tubercle anatomy, fruit structure and seed dispersal is provided.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00936197
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  • 5
    Electronic Resource
    Electronic Resource
    Didymocarpus geitleri, a remarkable new species ofGesneriaceae with deceptive pollen flowers (1989)
    Springer
    Plant systematics and evolution 165 (1989), S. 95-100 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Gesneriaceae ; Didymocarpus ; Morphology ; floral ecology ; Flora of Malaysia ; SE. Asia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Didymocarpus geitleri spec. nov. is described from Sungai Pandan, Kuantan distr., Pahang, Peninsular Malaysia. Distinctive features include: leaden-grey leaves with long, erect hairs on the upper side and whitish, campanulate flowers with a long exserted, bright yellow style. The colouring of the latter is caused by densely arranged glands. Together with two yellow blotches in front of the filament insertion, the style apparently acts as an anther (pollen) dummy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00936039
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    Paper (German National Licenses)
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