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Isolation of 1‐Allyl‐2,3‐dimethoxy‐4,5‐methylenedioxybenzene from Heckeria umbellata (L.) KUNTH (Piperaceae) From the leaves of Heckeria umbellata (L.) KUNTH an oily substance was isolated and its structure deduced. It is 1‐allyl‐2, 3‐dimethoxy‐4, 5‐methylenedioxybenzene (= Dill‐Apiol; 2) and not as previously published 1‐allyl‐2, 5‐dimethoxy‐3, 4‐methylenedioxybenzene (= Apiol; 1) [2].

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The isolation of gossypetin 3, 7, 8, 3-tetramethyl ether (ternatin) and herbacetin 3, 7, 8trimethyl ether is reported from the leaves of Larrea tridentata Cay. (Zygophyllaceae). The Jlavonoids and the acetate derivatives were identified by m.p., NMR and MS. Larrea Cay. (Zygophyllaceae) is composed of five species distributed in the arid and semi-arid regions of North and South America. Larrea is one of the selected taxa for comparative study as part of the International Biological Program [1]. The detection of twenty flavonoids mainly methyl ethers of flavonols, in the external leaf resin of North American L. tridentata has been reported [1, 2].