منابع مشابه
Molecular phylogeny of Persicaria (Persicarieae, Polygonaceae)
Relationships within the Polygonaceae have been recently examined using rbcL sequences, with an emphasis on Polygonum and its segregates. Here we test these results with respect to Polygonum (sensu lato) with an expanded dataset, including additional species and gene regions. Specifically, we focus on inferring the relationships of Eupersicaria (Polygonum sect. Persicaria in many prior treatmen...
متن کاملOn the resurrection of Persicaria puritanorum (Polygonaceae)
Pond populations in Cape Cod described as Persicaria puritanorum (≡ Polygonum puritanorum) have been treated by recent authors as a synonym of P. maculosa (≡ Polygonum persicaria) based on gross morphology. However, consistent differences in leaf and inflorescence features raise the question as to whether this is an extreme phenotype of P. maculosa, an ecotype of that species, or a distinct tax...
متن کاملTHE NATURE OF THE OVULAR STALK IN POLYGONACEAE AND SOME RELATED FAMILIES.—In the Polygonaceae the ovule in most
difficult. For this reason, the two means of the single experiments have been taken together and two new means calculated and their difference tested for significance both by the 't' and the 'Z' tests. For variance due to treatment 'Z = 1-426 (theoretical '2T for nx = 1 and n^ = 11 is = 1-133, P = o-oi); 'Z' for variance due to different days or occasion = 0-89641 (theoretical 'Z' for i\ = 11 a...
متن کاملMorphological Variation in Leaf Dissection of Rheum palmatum Complex (Polygonaceae)
AIMS Rheum palmatum complex comprises all taxa within section Palmata in the genus Rheum, including R. officinale, R. palmatum, R. tanguticum, R. tanguticum var. liupanshanense and R. laciniatum. The identification of the taxa in section Palmata is based primarily on the degree of leaf blade dissection and the shape of the lobes; however, difficulties in species identification may arise from th...
متن کاملAchene Morphology of Polygonum s.l. (Polygonaceae) in Thailand
– The achene morphology of 20 taxa in five sections of Polygonum s.l. from Thailand was studied and compared in detail using stereoscopic light and scanning electron microscopy. The achene of all Thai taxa is typically lenticular or triangular in shape. Three different morphological types are described according to the features of the achene surface; smooth-undulate, a star-like form and reticu...
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ژورنال
عنوان ژورنال: Review of Palaeobotany and Palynology
سال: 1988
ISSN: 0034-6667
DOI: 10.1016/0034-6667(88)90048-6