Abstract
The embryology ofHeliotropium scabrum andH. strigosum has been studied. The development of the anthers follows the dicotyledonous type, the tapetal cells become binucleate. The pollen grains are shed at the two-celled stage. Megaspore tetrads are linear and the development of the megagametophyte corresponds with the Polygonum type. The endosperm is cellular. The embryo development follows the Onagrad Type, i.e. the Capsella variation inH. scabrum and the Nicotiana variation of the Solanad Type inH. strigosum. The pericarp is differentiated into a one-layered epicarp with bulbous-based, unicellular hair, a 5–6-layered chlorenchymatous mesocarp and a 6–7-layered endocarp. The seed coat consists only of the thickened portions of the epidermis.
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References
Davis, G. L., 1966: The Systematic Embryology of Angiosperms. — New York: Wiley.
Gamble, J. S., 1928: Flora of Presidency of Madras,2. — Repr. Bot. Survey India, Calcutta (1957).
Gürke, M., 1897:Borraginaceae. In: Die natürlichen Pflanzenfamilien (Engler, A., Ed.)4/3a, 71–131. — Leipzig: Engelmann.
Johansen, D. A., 1950: Plant Embryology. — Waltham, Mass.
Johri, B. M., Vasil, I. K., 1956: The embryology ofEhretia laevis Roxb.—Phytomorphology6, 134–143.
Khaleel, Tasneem F., 1974: Embryology ofCynoglossum denticulatum DC. — Bot. Not.127, 193–210.
—, 1975: Embryology ofCordia. — Bot. Gaz.136, 380–387.
Khanna, Pushpa, 1964a: Embryology ofMertensia. — J. Ind. Bot. Soc.43, 192–202.
—, 1964b: Embryology ofTrichodesma amplexicaule Roth. — Bull. Torrey Bot. Cl.91, 104–114.
Maheshwari, P., 1950: An Introduction to the Embryology of Angiosperms. — New York: McGraw-Hill.
Millsaps, V., 1940: Structure and development of seed ofCynoglossum amabile Stapf. & Drumm. — J. Elisha Mitchell Sci. Soc.56, 140–164.
Nagaraj, M., Fathima, T., 1967: Embryological studies inRotula aquatica Lour. — Proc. Ind. Acad. Sci.,B, 66, 106–116.
—, —, 1968: A note on the sporogenesis and gametogenesis inAdelocaryum. — Curr. Sci.37, 265–267.
Pal, P. K., 1963: Comparative studies in four species ofHeliotropium. — Proc. Nat. Inst. Sci. India29, 1–40.
Singh, T. C. N., 1931: Studies in the morphology of the pollen grains. 1. (a)Borraginaceae. — J. Ind. Bot. Soc.10, 38–42.
Souèges, R., 1939: Embryogenie et Classification. Paris: Hermann et Cie.
—, 1943: Embryogenie des Boraginacees. Development de l'embryon chez leHeliotropium peruvianum L. — C. R. Acad. Sci. Paris217, 551–553.
Svensson, H. G., 1925: Zur Embryologie der Hydrophyllaceen, Boraginaceen und Heliotropiaceen. — Uppsala Univ. Årsskr. ser.2.
Venkateswarlu, J., Atchutaramamurti, B., 1955: Embryological studies inBoraginaceae. 1.Coldenia procumbens L. — J. Indian Bot. Soc.34, 235–247.
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Khaleel, T.F. Embryology ofHeliotropium scabrum andH. strigosum (Boraginaceae). Pl Syst Evol 129, 45–62 (1978). https://doi.org/10.1007/BF00988983
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DOI: https://doi.org/10.1007/BF00988983