279 
an old but no longer common species, 28 ft. high and 5 ft. in 
girth of trunk; and a fine healthy iree of the newer Japanese J/. 
hypoleuca over 30 ft. high. 
re is a good collection of hardy bamboos on the lower, 
damper part of the garden, and it was interesting to see Phyllo- 
stachys aurea flowering, although not gratifying, since it portends 
the flowering and consequent death of the species throughout the 
country. 
gu 4437 
XLIV.—BOCCONIA AND MACLEAYA. | 
J. HurcuHinson. 
The genus Bocconia (Papaveraceae) was founded by Linnaeus* 
in 1737, the type species being B. frutescenst from the West 
Indies and Central America. Since then several species have 
been described, of which seven stand as being authentic in the 
Index Kewensis. ‘These are natives of Central and South 
America, with the exception of two species, B. cordata, Willd., 
and B. microcarpa, Maxim., from North-Eastern Asia. Whilst 
the close affinity of the floras of North America and North- 
Jastern Asia has been well established, there is little, if any, con- 
nection between those of North-East Asia and South America, 
and the association of Papaveraceous plants of peculiar type from 
these two regions in the same genus, were it tenable, would be of 
considerable phytogeographical interest. That two very distinct 
genera are involved, however, is shown below. 
In the Appendix (p. 218) to the Narrative of Denham and 
Clapperton (1826), Robert Brown makes the following observa- 
tion: ‘* Respecting Bocconia cordata, though it is so closely allied 
to Bocconia as to afford an excellent argument in favour of the 
hypothesis in question, it is still sufficiently different, especially 
in its polyspermous ovarium, to constitute a distinct genus, to 
which I have given the name (Maéleaya cordata) of my much 
valued friend, Alexander Macleay, Esq., Secretary of the Colony 
of New South Wales, whose merits as a general naturalist, a pro- 
found entomologist, and a practical botanist are well known. 
In spite of this trenchant remark, however, Bentham and Hooker 
considered Macleaya to be congenerie with Bocconia, although 
Endlichert had in 1839 supported the views of Robert Brown, as 
did also subsequently Prantl§ and, lastly, Fedde. || 
I give below the differences observable between these two genera, 
‘and a revision of the species of Bocconia so far as we know them 
at present. 
* Linnaeus, Gen. ed. i. 32 (1837). 
+ Linnaeus, Sp. PI. 505 (1758). 
t Endlicher, Genera Plantarum, ii. 855 (18389). 
§ Prantl in Engl. et Prantl. Natiirlich. Pflanzenf. iii. 2, 140 (1889). 
|| Fedde, Monogr. Papaveraceae, 216 (1909). 
B 2 
