DR. H. F. HANCE ON NORTH-CHINA PLANTS. 79 
tuted by Torrey and Gray will be found to hold good on a 
general revision. 
13. CASSIA NICTITANS, L.—In humidis umbrosis paradisi impera- 
torii prope Peking, Aug. 1866, leg. Dr. S. W. Williams. 
Recorded by name in Maximowiez's ‘Index.’ The Chinese 
specimens, however, differ from the American I possess by being 
slenderer, by having narrower, acuter, more falcate leaflets, the 
petiolar glands smaller, flatter, and quite sessile, the stipules 
and bracts much narrower at the base 2. e. (more truly subulate) 
and the pedicels as long as the flowers, which are solitary. 
Hence I was disposed to regard it as a distinct but closely allied 
species, under the name of C. pseudo-nictitans ; but I observe 
that the most important distinguishing marks I relied on are 
included in the diagnosis given by Prof. Grisebach (FI. Brit. 
W. Ind. 211). The occurrence of this North-American and Ca- 
ribbean species in Northern China is remarkable: it has not 
hitherto been found in Japan, whence two or three others, com- 
mon tropical weeds, are alone known. 
14. POTENTILLA DAVURICA, Nestl. 
Father David, who sent me the species from the mountains 
around Peking, noted on his tickets that it has “ fleurs jaunes.” 
Ledebour, Lehmann (in his ‘ Revisio Potentillarum’) and, I be- 
lieve, all authors describe them as white. Do they vary in co- 
lour F or was there a lapsus seriptorius on the part of M. David? 
In the dried state they are no paler than those of P. fruti- 
cosa, L. 
15. PorENTILLA DISCOLOR, Bge.—In montosis Jehol, Maio flori- 
feram invenit R. P. David. 
My P. formosana, which I had approximated conjecturally to 
this, is not specifically distinct: one of Father David's speci- 
mens has similarly thickened root-fibres. 
16. POTENTILLA AMURENSIS, Mazim.—In alluviis a fluvio anno præ- 
terito depositis, ad angiportam Shiu-hing, fl. West River, prov. Can- 
toniensis, d. 7 Februarii 1867, collegit T. Sampson. 
The extension of this plant, only known hitherto from the 
Amur territory, into South-east China, is very interesting. Mr. 
Sampson’s specimens agree in all respects with authentic ones 
received from M. Maximowicz. Regel’s figure (Tent. fl. Ussur. 
t. iv. f. 1) is very good. 
17. AGRIMONIA VISCIDULA, Bge.—In saxosis fruticulosis collis cal- 
