Qualitative and quantitative analysis of biologically active principles ...

2. Materials and methods
2.1. Phytochemical analysis
2.1.1. Screening for baicalein
Allied species of Oroxylum indicum such as Stereospermum colais, S.
suaveolens, Dolichandrone arcuata, Radermachera xylocarpa and
Millingtonia hortensis (Bignoniaceae); Scutellaria colebrookiana and
S. violacea (Lamiaceae) were collected from various parts of Kerala.
Selected species and their profile
Oroxylum indicum (L.) Benth. ex Kurz (Plate 1a)
Local names: Aralu, Palakapayyani, Vellapathiri
Medium­sized deciduous trees. Leaves opposite, compound, 2­3
pinnate, pinnae 5­9; opposite; rachis 60­100 cm, stout, glabrous;
leaflets 3­5 in each pinnae,; lamina ovate, base cordate, oblique
or truncate; apex acuminate. Flowers 10 cm long, in lax terminal
racemes, reddish­purple outside, pinkish­yellow within, racemes
to 30­50 cm long. Fruit a capsule 40­75 x 5­8 cm, 2 valved,
compressed, tapering at both end; seeds 5­6 cm long, winged all
around except at base.
Stereospermum colais (Buch.­Ham. ex Dillw.) Mabb. (Plate 1b)
Local names: Pathiri, Poopathiri
Large deciduous trees. Leaves opposite, imparipinnate; rachis 10­
21 cm long,; leaflets 7­13, opposite; lamina elliptic­lanceolate,
elliptic­oblong, ovate or obovate; base oblique, acute or obtuse;
apex acuminate or caudate acuminate; margin entire or serrate,
glabrous above and puberulent beneath. Flowers bisexual, yellow
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