xiii, c, 6 Swingle: Merillia, a new Rutaceous Genus 337 
Museum, at South Kensington, in 1911, I now feel able to discuss 
this remarkable species, in many ways unique among the plants 
closely related to Citrus. In the first place all the known mem- 
bers of the tribe Citreae have either unifoliolate leaves or else 
pinnate leaves with strictly opposite leaflets. The other genera 
of the subfamily Citratae, such as Chalcas {Murray a ) , Clausena, 
Glycosmis, and Micromelum, have pinnate leaves with alternately 
arranged leaflets but never with a winged rachis. Up to now 
a single leaf, even if immature, would serve to distinguish 
any of these genera from the true Citreae. The Singapore 
plant has pinnate leaves with alternate leaflets and a narrowly 
but clearly winged rachis. All the pinnate-leaved members of 
the subfamily Citratae have a clearly marked petiole below the 
first pair of leaflets. The flowering specimen of Murraya cal- 
oxylon, collected in the Singapore Botanic Gardens in March, 
1918, shows sessile or subsessile leaves, the lowest leaflets being 
very small, nearly opposite, and attached near to or at the very 
base of the rachis. The fruits are even more remarkable, being 
like Chaetospermum in having a leathery rind, but differing 
widely in the irregularly lacunose pericarp and in having the 
walls of the locules solid. The seeds at first glance seem to 
be hairy like those of Chaetospermum and Aegle, but closer 
examination of what appear to be hairs shows that they are 
thin, elongated, somewhat fimbriate paleae. The seeds also show 
an ariloid ridge at one edge, unlike the seeds of the other mem- 
bers of this subtribe. 
Many other characters of less importance serve to mark olf 
this plant as perhaps the most remarkably aberrant of the 
citrous fruits. 
I take pleasure in naming this remarkable new genus in 
honor of Professor E. D. Merrill, who has done so much valu- 
able work on the flora of the Philippines, the Malayan region, 
and southern China. 
MERRILLIA genus novum 
(Rutaceae, Citratae, Balsamocitrinae) 
Genus Chaetospermo (Roem.) Swingle ut videtur affinis 
perspicue differt ovario 5- vel 6-loculare, pericarpio irregulariter 
lacunoso, seminibus dense paleaceis, paleae elongatae, membra- 
naceae, leviter laciniatae, foliis sessilibus, pinnatis, rhachibus 
anguste alatis, foliolis alternis. 
Arbor inermis. Folia pinnata, sessilis vel subsessilis, rhachi- 
bus anguste alatis ; foliola alterna, inferioribus parvis,'; sursum 
gradatim ma.iores, terminalibus majoribus; petiolulo brevissimo. 
