be /t> 



ME. DiRWIN ON THE DIMOBPHIC CO>'Dn'IO>; IN PRIMULA. /7 



Ccelanthium, limited to two Cape species, differs from Pliarna- 

 ceum as Thylacospermum from Arenaria, by the uniou of the sepals 

 at tlie base into a eampanulate tube, round the edge of which are 

 inserted the stamens, being thus much more decidedly perigynoua 

 than in the rest of the group. 



The genera Psammotroplie, Eckl. & Zeyh., and Polpoda, Presl, 

 with uniovulate cells to the ovary, enumerated by Fenzl among 

 Molluginese, appear to have nothing to distinguish them from true 

 Phytolaccacese. Adenogramma, Presl, is also a Phytolaccaceous 

 plant allied to Oiesehia, where the ovary and fruit are reduced to a 

 single one-seeded carpel, not compounded of 2 or 3 carpels although 

 one-seeded as in Paronychiaces. Acrossantlies, on the other hand, 

 both in habit and character, belongs to the apetalous Ficoideas. 



IV. Pabonychiace^. 



Without having sufficiently examined all the genera of this Order 

 to ascertain their limits with respect to each other, or the order 

 of their arrangement, we have, however, verified the ordinal cha- 

 racters in all the following (except Cardianema) : — 



1. Corrigiola, Linn, (an exceptional genus in its prominent petals 

 and alternate leaves) ; 2. Herniaria, Linn. ; 3. Illecehrum, Linn. ; 

 4. Cardionema, DC. ; 5. Pentaccena, Bartl. ; 0. Paronychia, Juss. 

 (including Siphonychia, Torr. et Gray, and Anychia, Eich., and 

 perhaps altogether, with Cardionema and Pentaccena, artificial sec- 

 tions oi Illecebrum) ; 7. TIahrosia, Fenzl; 8. Sclerocephaliig,Tioiaa.; 

 9. Gymnocarpos, Forsk. ; 10. Pterantlius, Forsk. ; 11. Cometes, 

 Burm. ; 12. Picheranthtis,Wehh ; 13. Pollichia, Soland. ; 14. Gitil- 

 leminea, H. B. et K. ; 15. JiLniarum, Forst. ; 16. Scleranthus, Linn. ; 

 and 17. Lastarriea, A. Gay. 



On the Two Forms, or Dimorphic Condition, in the Species of Pri- 

 mula, and on their remarkable Sexual Halations. By Chakles 

 Dabwin, M.A., F.E.S., F.L.S., &c. 



[Kead Nov. 21, 1861.] 



If a large number of Primroses or Cowslips (P. vulgaris and veris) 

 be gathered, they will be found to consist, in about equal numbers, 

 of two forms, obviously differing in the length of their pistils and 

 stamens. Florists who cultivate the Polyanthus and Auricula 

 are well aware of this difference, and call those \\hich display the 

 globular stigma at the moutli of the corolla '' pin-headed " or " pin- 

 eyed," and those which display the stamens "thumb-eyed." I 



M,,. Hnt- Garde!!, 



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