2S eee er Se 
ee ae 
A contribution to our knowledge of Arisaema triphyllum 
F. L. Piekeir 
(WITH PLATES I—5 AND 70 TEXT FIGURES) 
SECTIONAL TOPICS 
ENI ROOOCTORY. 5.5 0.0% en oa 0 Oe at ee ae ee ees I 
‘TIME OF DEVELOPMENT OF FLOWERS. so aeae 00 a 3 
THE STAMINATE FLOWER AND MICROSPORES................ 4 
Vere we ares WEOWHE 8c oe oS T | 
TE PR a NS ek eae ode Se eek bale Poss 9 
ee Wie saa os in sil So's gee ey We we Mie tis II 
Cs Ns oc cpg ees eae ee te cs webs 13 
PR cc ae ta Po eed ale ce SERAN 17 
TEHE RESIDUAL CANIN e E N en Sv ee ek 20 
TRE SEED COATS. AS oe Go ees A e E es wea es 21 
EME BRUIT. aean IGRI Ci le ee ee Oe sa ue eases ne 23 
DEVELOPMENT AND LIFE OF THE CORM...............--0-- 24 
THE ROOT WET os iia ed Be ee es oe Pw 8 31I 
LEAF STRUCTURE AND PEVELOPMENT... Le. o auela 33 
SrRucTume OF PRIIOLE AND SCAPE... n.o... ona 36 
MEE ek E ees 38 
E RINE SN cee ee os yg ee Le pee theta 39 
, TERATOLOGICAL PHENOMENA AND VARIATION...........-.- 43 
RELATION TO UROMYCES CACAD 200 <2.) i. as. 48 
SUMMARY 505 a ee ee eee Ve eke 49 
INTRODUCTORY 
Arisaema triphyllum (L.) Schott (TEXT FIG. 1) is one of the 
most common as well as most widely distributed of the aroids. 
As such it would seem profitable to give it more attention than 
has been given. The present work is the result of an attempt 
to bring together and check up what has been reported, to com- 
plete fragmentary parts of reported history, and to call special 
attention to any features new or unique. It is not the intention 
to enter into any theoretical discussion, but to present facts as 
observed. The work has extended over a period of six consecutive 
[MEMOIRS OF THE TORREY BOTANICAL CLUB, VOLUME 16, No. 1. Issued Aug. 
30, 1915.] 
I 
