PORTULACE.E, AND THEIR ALLIES. 73 
They comprise the eleven following genera :—1. Drymaria, Willd. ; 
2. Polycarpon, Linn.; 3. Ortegia, Linn.; 4. Leflingia, Linn. ; 
5. Cerdia, Mog. et Sess. ; 6. Pycnophyllum, Remy; 7. Lyallia, 
Hook. fil. ; 8. Microphyes, Philippi; 9. Stipulicida, Rich. ; 10. Poly- 
carpea, Lam.; and 11. Spherocoma, Anders. Very few of these 
require any special observations. 
Arversia, Cambess., or Hapalosia, W. et Arn., ought in our opi- 
nion to be reduced to Polycarpon. The embryo is indeed straighter 
in Arversia (Hapalosia) Leflingii than is usual in Polycarpon, 
but it is very variable in the undoubted species of the latter genus, 
and I have in vain searched for the spiral twist in the valves of 
the capsule supposed to characterize the typical P. tetraphyllum. 
Stichophyllum, Philippi, figured in his ‘Flora of Atacames,’ 
proves, on examination of his specimens, to be identical with one 
species of Pycnophyllum, Remy. The same plant in Meyen’s col- 
lection received from Presl the manuscript name of Xeria Meyeni- 
ana, and is, according to Walpers, the Arenaria bryoides, Willd. 
Lyallia, Hook. fil., is but very imperfectly known, and is only 
placed here from its close resemblance in habit to Pyenophyllum. 
Cerdia, Mog. et Sess., is only known from DeCandolle’s charac- 
ters taken from Mocino and Sesse’s drawing. 
Polycarpea, Lam. (proposed by Webb to be spelt Polycarpia, 
but perhaps without sufficient grounds for disturbing the esta- 
blished orthography), is now a large genus divisible into several 
groups, some of them distinguished by habit without characters, 
and others which have more definite characters have so precisely 
the aspect of the typical Polycarpeas that we cannot adopt them 
as separate genera. I allude especially to the two supposed Au- 
stralian genera, Aylmeria, Mart., and Planchonia, J. Gay. The 
former closely resembles the common P. corymbosa, but the flowers 
are rather larger and more scarious, and there are 5 minute sta- 
minodia alternating with the stamens at the base of the petals. 
In Planchonia, of which we have five or six species, the flowers are 
often still larger and more scarious ; there are no staminodia ; but 
the petals and stamens are united, sometimes above the middle 
into a long tube, sometimes at the base only into a shorter cup. 
Yet striking as the character is in some species, it is one of degree 
only, and a slight union may be observed in some other non- 
Australian species. 
Spherocoma, T. Anders., like Queria, is intermediate between 
Caryophyllea and Paronychiacee. The fruit is an indehiscent 
utriculus as in the latter order; but the presence of petals, and 
