Q2 BOTANICAL GAZETTE [SEPTEMBER 
induce a tendency to the repetition of a definite series of forms, 
monotonous in the basic features of their construction, but endlessly 
varied within their given limits. 
Batrour LABORATORY 
CAMBRIDGE, ENGLAND 
LITERATURE CITED 
1. ARBER, AGNES, The phyllode theory of the monocotyledonous leaf, with 
special reference to anatomical evidence. Ann. Botany 32:465-s501. 1918. 
s e vegetative ar ee of Pistia and = Lemnaceae. Proc. 
Roy. Rec. B. g1:96—103. 1 
2. , Leaf-base cape pas the Liliaceae. Bor. GAz. 69:337-340- 
1920. 
4. , Tendrils of Smilax. Bor. Gaz. 69:438-442. pl. 22. 1920. 
5 , On the leaf structure of certain —— considered in relation to 
the phylicds theory. Ann. Botany 34:447-4 
6. ————,, The leaf structure of the Iridaceae, ‘nnabdeela in relation to the 
phyllode esti Ann. Botany 35: 301-336. 1921. 
———.,, Leaves of the Helobieae. Bor. Gaz. 72:31-38. pl. 1. ci 
prpenn of certain Amaryllids. Bor. Gaz. 72:102-105. 
e , On the development and morphology of the leaves af nes, 
Proc. Roy. Soc. B. 93: 249-261. 1922. 
, On the leaf-tips of certain monocotyledons. Linn. Soc. Jour. 
Bot. 46: 467-476. 1922 
11. ENGLER, A., Die systidtnatinchse Anordnung der monokotyledoneen Angio- 
spermen. Abbas di. Akad. Wiss. Berlin. Abhandl. Il. 1-55. 1892. 
12. Gitck, H., Die Stipulargebilde der Monokotyledonen. Verhandl. Nat.- 
Med. Vereins Heidelberg. N.F. 7':1-96. pls. 1-5. 1901. 
13. GorBEL, K., Organographie der Pflanzen. Zweite Auflage. Teil 1. 
oem 
Allgemeine Onganographie 1913. 
14. MCLEAN ., The utilization of herbarium material. New Phytol. 
45: ote. 
15. a Oe Sratbecae in Martius, C. F. P. von, Flora Brasiliensis 
: part 3. 1892. 
16. Pobisel V. A., Anatomiske Studier over Si yels Shhertens vegetative 
Organe. Videnskab. Meddel. Naturhist. Forening Kjgbenhavn. pp. 133- 
152. pls. 2, 3. 1892 for 1801. 
. SEUBERT, M., Xyridaceae and Mayaceae, in Martius, C. P. F. von, Flora 
Brasiliensis. 3: part 1 
18. VELENOVSKY, J., Venisihiends Morphologie der Pflanzen. Teil 2. 1907. 
Lal 
~J 
EXPLANATION OF PLATES I-III 
Throughout, xylem (xy) shown in black; phloem (ph) in white; and 
fibers (f) dotted; Jac, lacuna; pp, palisade parenchyma; mb, median bundle; 
