Madhuri ji, interestingly it is not achene in the real sense, but a term very commonly used in this family. The fruit type is actually cypsella (formed from two united carpels with inferior ovary, dry fruit containing single seed). The real achene is found in Ranunculaceae. in Ranunculus, Anemone, Clematis, etc. carpels are free and single seeded dry fruit is formed from single carpel. In other genera, Delphinium, Aquilegia, etc., each free carpel contains more than one ovule, and fruit matures into follicle.
-- Dr. Gurcharan Singh Retired Associate Professor SGTB Khalsa College, University of Delhi, Delhi-110007 Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018. Phone: 011-25518297 Mob: 9810359089 http://people.du.ac.in/~singhg45/ On Fri, Nov 4, 2011 at 3:48 PM, Madhuri Raut <[email protected]> wrote: > Thank you Sir ji for the paper. Very nice paper on key to the genera based > on achene characters. And yes today I learned a new word in Botany 'achene' > meaning single-seeded fruits .Thank you > > > On Fri, Nov 4, 2011 at 3:00 PM, Gurcharan Singh <[email protected]>wrote: > >> Thanks a lot Madhuri ji. The last photograph is very useful for this >> group of steraceae. In fact one can identify the plant only from this. Here >> is my paper on this published in 1972. >> >> >> -- >> Dr. Gurcharan Singh >> Retired Associate Professor >> SGTB Khalsa College, University of Delhi, Delhi-110007 >> Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018. >> Phone: 011-25518297 Mob: 9810359089 >> http://people.du.ac.in/~singhg45/ >> >> >> On Fri, Nov 4, 2011 at 2:54 PM, Madhuri Raut <[email protected]> wrote: >> >>> Sir ji, >>> Very beautiful set of photographs. esp >>> *Lactuca-scariola-Balgarden-Kashmir-3-DSC06662.jpg >>> and the one showing *dehiscence. Never seen something like this >>> before.Thank you Prasad ji for mentioning the word. I was waiting for >>> someone to mention it so that I can share my appreciation too as I did not >>> know how to describe it. >>> >>> >>> On Fri, Nov 4, 2011 at 2:45 PM, Gurcharan Singh <[email protected]>wrote: >>> >>>> Thanks Prasad ji >>>> >>>> >>>> -- >>>> Dr. Gurcharan Singh >>>> Retired Associate Professor >>>> SGTB Khalsa College, University of Delhi, Delhi-110007 >>>> Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018. >>>> Phone: 011-25518297 Mob: 9810359089 >>>> http://people.du.ac.in/~singhg45/ >>>> >>>> On Fri, Nov 4, 2011 at 2:42 PM, prasad dash >>>> <[email protected]>wrote: >>>> >>>>> Sit to me both DSC06683 and DSC06267 are awesome. Never seen such a >>>>> wonderful phorograph (DSC06267) of dehiscence. >>>>> >>>>> Regrads >>>>> >>>>> prasad >>>>> >>>>> * * >>>>> >>>>> On Fri, Nov 4, 2011 at 2:14 PM, Gurcharan Singh <[email protected]>wrote: >>>>> >>>>>> *Lactuca serriola* L., Cent. pl. II:29. 1756 (Amoen. acad. 4:328. >>>>>> 1759) >>>>>> syn: *Lactuca scariola* L.; *Lactuca augustana* All. >>>>>> >>>>>> Common name: Prickly lettuce >>>>>> >>>>>> Tall prickly herb reaching 1.5 m, branched, prickly towards base; >>>>>> leaves sessile, pinnatifid with toothed segmrnts pointing downwards, >>>>>> prickly on midrib and nerves beneath, upper leaves stem-clasping with >>>>>> arrow-shaped base; heads yellow, 9-12 mm in diam., in long panicles with >>>>>> spreading branches; involucre bracts oblong; achene brown nearly 3 mm >>>>>> long >>>>>> with slender almost as long longer beak, pappus hairs white. >>>>>> >>>>>> Very common in Kashmir valley in wastelands, borders of fields and >>>>>> road sides , photographed from Balgarden and University Campus in August. >>>>>> >>>>>> -- >>>>>> Dr. Gurcharan Singh >>>>>> Retired Associate Professor >>>>>> SGTB Khalsa College, University of Delhi, Delhi-110007 >>>>>> Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018. >>>>>> Phone: 011-25518297 Mob: 9810359089 >>>>>> http://people.du.ac.in/~singhg45/ >>>>>> >>>>>> >>>>> >>>>> >>>>> -- >>>>> Prasad Kumar Dash >>>>> Ecologist, Orissa, India >>>>> email: [email protected] >>>>> ph. 09437444241 >>>>> >>>> >>>> >>>> >>>> >>> >>> >>> -- >>> Regards >>> Dr.Bhagyashri Ranade >>> >> >> >> >> > > > -- > Regards > Dr.Bhagyashri Ranade >
