644 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
species of Gnaphalium , Achillea, Artemisia, &c. (5) Dwarf plants with 
woody prostrate stems : Azalea procumbens, species of Salix, &c. 
Production of Seed on Cut Inflorescences.* * * § — According to Herr H. 
Lindemuth there are plants which rarely produce fertile seed under 
ordinary circumstances, but which do ripen their seed on inflorescences 
which are cut off from the plant and dried. This is the case with 
Lachenalia lutea, and very often with Lilium candidum. 
Inflorescence of Urticacese and Moraceae.f — As the result of an 
examination of the nature of the inflorescence in 0 ; number of genera 
of Urticaceae and Moraceae, M. M. Golenkin states that it is of two 
kinds: — (1) Dichasial ; the development of the axis may vary greatly; 
but the dichasia have always two primary bracts at their base, and are 
always formed in the axil of ordinary or of reduced leaves. (2) Dorsi- 
ventral ; the development of the axis varies also in this case, and the 
inflorescence may be composed of dorsiventral racemes or spikes. In 
both cases the inflorescences are axes of the third, or rarely of the 
second order. 
Vegetative Organs of Papaveraceae and Fumariaceae.J— On ana- 
tomical grounds M. L. J. Leger unites these two orders, and gives a 
detailed account of their anatomical structure, especially in relation to 
the laticiferous apparatus. Laticifers occur throughout the two orders ; 
they are always composed of cellular elements, isolated, or united into 
longitudinal rows, often collected into islets ; in the longitudinal rows 
the transverse walls are sometimes more or less entirely resorbed. Both 
transverse and longitudinal walls are often perforated, and may become 
sclerotised without losing their original function; they have no com- 
munication with the vascular tissue. The latex varies greatly in its 
character in the different genera, and, in some genera, has disappeared 
in the mature plant. 
Hydathodes.§ — Dr. G. Haberlandt classifies these structures, which 
have for their function the absorption and secretion of water, under 
two general heads, hydathodes with, and hydathodes without, any direct 
connection with the water-conducting system. The former may be 
unicellular, and are then always transformed epidermal cells, or multi- 
cellular, when they are also trichomic, and consist, in their simplest 
form, of three cells, a basal or foot-cell, a stalk-cell, and an apical cell, 
which is always the secreting cell. The second type of hydathode is 
again divided into those with and those without water-clefts, the latter 
being the fern-type. The former kind may be with or without an epi- 
theme, the excretion depending, in the latter case, on pressure-filtration. 
In the former case the epitheme-tissue may or may not take a direct part 
in the excretion of the water. All hydathodes which actively excrete 
water are distinguished by an abundant protoplasm, and by a relatively 
large nucleus, resembling, in this respect, other glandular organs. The 
* Ber. Deutsch. Bot. Gesell., xiv. (1896) pp. 244-6. 
t Bull. Soc. Imp. Nat. Moscou, 1896, pp. 1-24 (1 pi. and 8 figs.)J(G(rman). 
% Mem. Soc. Linn. Normandie, xxviii. (1895) pp. 193-624 (10 pis. and 38 figs.). 
See Bot. Centralbl., 1896, Beih., p. 253. 
§ SB. K. Akad. Wiss. Wien, civ. (1895) pp. 55-116 (4 pis.). Cf. this Journal, 
ante, p. 204. 
