The flowers are tetracyclic, pentamerous, and hypogynous. The ovary of the bicarpellary syncarpous gynoecium is bilocular at the base and unilocular towards the apex or bilocular towards the base and apex and unilocular in the middle. The sepals are three traced and the origin of the sepal traces is peculiar in Pittosporum heterophyllum and P. rhombifolium. The petals and stamens are one traced. The heteromerous flowers of P. revolutum stand apart in perianth and androecial characters. The carpels are three traced except in P. phyllarioides, where they are five traced. There is adnation of traces between petals, stamens, and gynoecium and this precedes the external fusion. Judging from the position of the ventral bundles, the placentations can be described as parietal, anatomically parietal, or both in different parts of the ovary. A true nectariferous disc is lacking. The basal peripheral portion of the ovary resembles the disc, showing deep-staining cells, and it is devoid of any vasculature.
A simple, rapid, highly sensitive and new simultaneous spectro- photometric method is proposed for the analysis of chromium(VI) and vanadium(V) without separation by using 3,4-dihydroxybeznaldehyde isonicotinoyl hydrazone (3,4-DHBINH). The reagent reacts with the two metal ions in acetic acid-sodium acetate buffer of pH 5.5 and gives maximum absorbances at 400 nm and 360 nm for chromium(VI) and vanadium(V), respectively. Both the metal ions gives 1: 1 (M:L) complexes with the reagent. Effect of various diverse ions also studied. The instability constants for the two complexes were also evaluated. This method was successfully applied for the determination of chromium(VI) and vanadium(V) in various spiked samples. The validity of the method was checked by comparing with the results obtained by atomic absorption spectrophotometry.
The floral anatomy of Tropaeolum majus, T. minus, T. peregrinum and Magallana porifolia has been studied. The flower is pentacyclic, bisexual, hypogynous and zygomorphic owing to the development of a spur on the posterior sepal. The perianth is 5‐merous, androecium is 4‐merous and the gynoecium is 3‐merous. The sepals are 3‐traced and the petals and stamens are single traced. The 3‐carpellary condition of the ovary is derived from 5‐carpellary ancestry. The carpels are 3‐traced with one ovule in each loculus on axile placentation.
In the light of the present study together with the available data from other disciplines, the affinities and systematic position of Tropaeolaceae have been discussed. It is concluded that the Tropaeolaceae find a place in Geraniales.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.