THE ANDR(ECIUM OF MENTZELIA. 
200 
V. arrensis, in seed bj May 25, H. 
W. HocJcin. 
*Salvia Verbenaca, May 14. 
Thymus Serpylliun, fully out May 11, 
G. T, Sjpanlcie (only in a warm spot ; 
not observed elsewhere before June) . 
Plantago media. May 23, /. Pole, 
Eumex Acetosella, by May 25. 
Polygonum Bistorta, by May 28, i2. C, 
Davis, 
Urtica urens. May 13, W, R. Carles. 
U. dioica, buds as early as May 15, 
7F". W. Dayman, 
*Jiiglans regia,by May 4, A, Marshall. 
*Castanea vulgaris, in bud May 23, 
/. Pole, 
Tamus communis, May 28, P. S. Ro- 
bin son. 
Orchis ustulata, by May 23, 0. Ilherf, 
O. maculata. May 23, R, C. Davis, 
O. latifoHa, May 25, PF. W, Melville, 
Habenaria chlorantha, buds nearly 
out May 11, A. Marshall. 
Listera orata, May 24, P!, Lloyd. 
Neottia Nidus-avis, May 19, E, W, 
Collinson, 
Iris PsGudacorus, May 27, W. Q, 
North and J, Bourdillon. 
Polygonatum multiflorum, May 13, 
W. R. Carles, 
*Ornithogalum umbcUatum, May 9. 
Allium ursinum, by May 20, 
Cares divulsa, by May 20. 
C. glauca. May 3, T, PI, Maclean, 
C. sylvatica, by May 31. 
Alopccurus agrestis, May 1, /. W, V, 
Taylor. 
Milium elTusum, May 3, /. Pole, 
Holcus mollis, by May 25. 
Avcna pubescens, May 12, /. W, V, 
Taylor, 
Arrhenatherum avenaceum, May 29. 
Koeleria cristata, May 26. 
Melica uniflora, by May 13. 
Poa trivialis, by May 25. 
P. px-atensis, May 7^ R, P. Maimca- 
ring, 
Briza media. May 22, A, Marshall, 
Dactylis glomerata. May 8, /. W, V, 
Taylor, 
Festuca ovina. May 2. 
Bromus erectus, May 27, Mrs. Plaice, 
B. sterilis, May 7, /. JF, V, Taylor, 
Serrafalcus racemosus, by May 26. 
S. moUis, May 7, /. W, V, Taylor. 
Lolium percnne. May 8, R, R. P. 
Hilton, 
Barley, in ear by May 19, R. R. P. 
Hilton, 
ON THE MOEPHOLOGICAL CONSTITUTION OF THE AN- 
DECECTUM OF MENTZELIA, AND ITS ANALOGY WITH 
THAT OE CEETxUN KOSACE^.* 
By Alexander Dickson, M.D. Edin. 
(Plate XXXIII.) 
In his ' Organogcnie ' Payer has given full details of the floral de- 
velopment in Mentzelia and Bartonia. He has pointed out the re- 
markable difference between the development of the androscium in these 
plants, where there is a centripetal evolution of stamens, and that in 
Read before the Botanical Society of Edinbiu-gli, Maj 11th, 18G3. 
