Abstract
In the present study leaf venation types of 30 Saxifraga L. species, found in Indian Western Himalaya, were studied. Out of these, leaf venation patterns of 20 species were not previously studied. In total, five major types of leaf venations- acrodomous (perfect-basal; perfect-suprabasal; imperfect-suprabasal), camptodromous (eucamptodromous), campylodromous, hyphodromous, and palinactinodromous – were recorded. Section Micranthes show palinactinodromous; section Ciliatae show mainly acrodromous; section Mesogyne show palinactinodromous; and sect. Porphyrion show acrodromous, eucamptodromous and hyphodromous types of venation. Palinactinodromous appear as the ancestral venation type.
Highlights
Leaf venation refers to the pattern of veins and vein branching in a leaf (Simpson, 2019)
The venation pattern is identified using the classification of leaf architecture described by Hickey (1973, 1979)
Saxifraga is one of the larger genera in angiosperms and many species, those occurring in the Sino-Himalayan region, are not very well known and studied
Summary
Leaf venation refers to the pattern of veins and vein branching in a leaf (Simpson, 2019). Foliar veins and veinlets help to conduct water, minerals, hormones and food between the leaf and the stem, and within the leaf. They provide mechanical support to the leaf. In the flowering plants two traditional categories (dicotyledons and monocotyledons) can be differentiated on the basis of leaf venation baring few exceptions. It is an important trait of plants used in specifying and grouping plants (Walls, 2011). The most widely used and comprehensive classification of leaf venation was given by Hickey (1973, 1979). The Hickey’s classification was developed further in the manual of leaf architecture (Ellis et al, 2009)
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