If you notice properly in the first pic of Dinesh sir, you can see that in one flower all anthers are pointed upwards where as in other two the anthers are pointed downwards and backwards.
There are phenomena in plants called HERKOGAMY [Herkogamy is a common strategy employed by hermaphroditic angiosperms to reduce sexual interference between male (anthers) and female (stigma) function. ] and DICHOGAMY [Dichogamy, also known as sequential hermaphrodism, is the separation in time of gender expression in a hermaphroditic organism. In the context of the plant sexuality of flowering plants (angiosperms), there are two forms of dichogamy: protogyny—female function precedes male function—and protandry—male function precedes female function.] . Zizyphus had protoandrous flowers, i.e., androecium develops to maturity first and after sometime gynoecium attains maturity, in simple words, there is a distinct delineation of male and female phase in the same flower as both anther and stigma dont mature at one time hence inhibiting self pollination. In the flower above, the anthers mature first (during erect position as in the picture, which has white pollens on the anthers] but stigma remains immature, hence the insect will come collect pollens from the erect anthers but pollens wont be able to get deposited on the stigma of the same plant because the stigma will not be mature enough to let the pollen stick to it. Hence if and when the insect will visit another flower which has mature stigma, pollen gets deposited. In other words, pollen from one flower is avoided from getting deposited on the stigma of the same flower. There are some other terms here which are useful: Geitonogamy: In this pollination of a flower with the pollen from another flower on the same flowering plant. Xenogamy: In this pollination of a flower takes place by pollens from a different plant . Read following links for more knowledge: http://en.wikipedia.org/wiki/Herkogamy http://en.wikipedia.org/wiki/Dichogamy Hope I am understandable. Pankaj On Wed, Jan 5, 2011 at 12:47 AM, Dinesh Valke <[email protected]> wrote: > NATIVE, WILD, CULTIVATED :: Rhamnaceae (buckthorn family) » Zizyphus > mauritiana ... also spelt: Zizyphus > > > ZIZ-ih-fuss -- an ancient Greek name derived from the Persian word zizafun > maw-rih-tee-AY-nuh -- of or from Mauritiana, a north African area > > > commonly known as: Chinese apple, Chinese date, cottony jujube, Indian > jujube, Indian plum, sour jujube, Yunnan jujube, Yunnan spiny jujube • > Hindi: बदर badar, बेर ber, कुबल kubal, फेनिल phenil, पिच्छल picchal • > Kashmiri: bari, konkamber, phitni • Konkani: बॉर्र boaarr • Manipuri: boroi > • Marathi: बोर bor, सौबरी saubari • Punjabi: amlai, barari, simli, singli • > Sanskrit: बदर badar, बद्री badri, सौवीर sauvir • Tamil: எளந்தை elandhai • > Telugu: రేగు regu > > > Native to: south Asia (mainly India) > > > -- *********************************************** "TAXONOMISTS GETTING EXTINCT AND SPECIES DATA DEFICIENT !!" Pankaj Kumar Ph.D. (Orchidaceae) Research Associate Greater Kailash Sacred Landscape Project Department of Habitat Ecology Wildlife Institute of India Post Box # 18 Dehradun - 248001, India
