412 Hill . — The ' Morphology and Seedling Structure of the 
Two seedlings were found amongst the roots of the specimen at Kew, 
and they agree closely with those of P. pedicellata already described. The 
hypogeal cotyledon is somewhat obovate in shape, and slightly concave, 
whilst the aerial cotyledon is broadly oblong, acute, trinerved, and only 
peltate at the base. The primary root grows vertically downwards, but at 
its base a lateral secondary root is very soon developed which grows 
upwards, and then bending out horizontally continues to grow in this 
direction (Figs. 44 and 45). 
It is unfortunate that the whole course of the development of the plant 
cannot be followed in this species, but it seems probable that the roots may 
get carried round to the upper surface, as in the other Mexican species, and 
that the rhizome is produced by the continued growth of the stem-apex. 
The leaves of the mature plant have fairly long and slender petioles, 
their laminae are ovate-lanceolate in outline, trinerved, and scarcely peltate ; 
in texture they are thin and membranous when dried, and the plants 
evidently grow in damp and shady places (v. Fig. 42). 
Another plant, which should probably be placed here, is Hartweg’s 
specimen 1 from Aguas Calientes in North Mexico: it has a short stout 
tuberous rhizome with roots arising from all over the surface. The upper 
part is marked by closely crowded leaf- scars. The ripe fruits with their 
large pericarps differ considerably from those of other species, but no 
seedlings have as yet been found. 
P. MACRANDRA, C. DC. 
The only other species of this group, of which we have knowledge of 
the seedlings, is a well-marked species, which appears to have been confused 
with P. M idler i, C. DC. 2 , but which is now known as P. macrandra , C. DC. 
The plants in question were collected by Pringle 3 in Mexico, at an elevation 
of 8,500 feet ; they are of particular interest in having a very definite creeping 
rhizome, which is somewhat tuberous in character, and bears roots on the 
lower side (Fig. 46, PI. XXX). 
The leaves are all radical and spring from the apex of the rhizome, 
and the whole plant is glabrous. The petioles have broad bases, and large 
semicircular or reniform leaf-scars are left on the rhizome by the fallen 
leaves 4 . There is no overlapping of petiole bases as in P. M idler i, C. DC. 
The rhizome is about 4 mm. in diameter. The leaf lamina is broadly 
ovate-lanceolate, acute, peltate with five principal veins, the insertion of the 
1 Benth., PI. Hartweg, p. 293. This plant, No. 1621, is referred to P. monticola, Miq., which 
does not appear to be a correct determination ; a plant collected by Schaffner (No. 108) at San 
Louis Potosi seems to be identical with No. 1621 (Herb. Kew). 
15 Linnaea, xxxvii, p. 366-7; Dahlst., 1 . c., p. 37. 
3 Pringle, No. 4654, on the wet ledges of the Sierra de San Felipe, Oaxaca, Mexico. Herb. 
Kew and Herb. Brit. Mus. Labelled P. Mulleri, C. DC., glabrous form. 
4 Since writing this paper I have paid a visit to Geneva and find that M. de Candolle has 
described this plant as a new species in the Ann. du Conserv. et Jard. Bot. Geneve, 1898, p. 276. 
