94 BOTANICAL GAZETTE [SEPTEMBER 
Fic. 15.—Xyris montivaga Kth.: pair of opposite bundles (xy, and pfhr, 
xy, and ph) in common fibrous sheath (318); similar to 6, in fig. 14 A 
(X. anceps). 
Fic. 16 A, B.—Tritonia (garden hybrid) for comparison, lettering as in 
fig. 15; fibers represented in black (instead of white with double lines indicating 
thickness of walls, as in other figures): A, pair of opposite bundles from trans- 
verse section of leaf limb (318); B, similar pair of bundles, but with 
xylems fused (318 
Fic. 17 A-C.—Xyris gracilis R.Br.: A, leaf consisting mainly of leaf 
sheath, with reduced limb (/); B, apex of another reduced leaf in which limb 
is absent (both natural size); C, transverse section of leaf shown in B (slightly 
enlarged). 
Fic. 18 A-B.—X-yris brevifolia Mich.: A, transverse section leaf limb 
(X23); B, marginal bundle such as that marked x in A (X193). 
1G. 19 A~D.—Eriocaulon: A and B, E. septangulare With.; A, transverse 
section of limb of leaf (X23); B, lamella marked x in A (X77); we, upper 
epidermis, /e, lower epidermis; d, fragment of diaphragm seen in surface view; 
C, E. Wallichianum Matt. f. submersa, apex of leaf (<4); D, E. cuspidatum 
Dalz., eae of leaf to show mucro (<4). 
Fic oA, B.—Tillandsia usneoides L., transverse section leaf (X23): 
A; POS B, ‘ion 
PLATE Ul 
Fic. 21 A-C.—Pritzelia pygmaea F. Muell., transverse section leaf: 
A, sheath; B, limb (X23); orientation of B uncertain; C, margin of sheath in 
A (X77) to show stomate (s/) and crystals (c). 
Fic. 22.—Philydrum lanuginosum Banks, transverse section limb of leaf 
(X14). 
Fic. 23 A-C.—Helmholtzia acorifolia F. Muell., A and B, transverse sec- 
tion limb of leaf (X23): A, midrib region (mr); B, margin, to show normally 
orientated bundles and bundle groups (vd) and inversely ovicatated bundles 
and bundle groups (ib); C, inverted bundles of midrib from section similar to 
A (X77). 
Fic. 24.—Rapatea loupe Spr., small leaf (<4). 
Fic. 25 A-C.—Rapatea angustifolia Spr.: A and B, transverse section leaf 
(x14); A, sheath; B, limb; C, median bundle (mb), of limb in B (X77). 
Fic. 26 A-C.—Cephalostemon affinis Koern: A, B, transverse section 
leaf (X14); A, sheath; B, limb; C, median bundle of limb (X77). 
Fic. 27 pes —Mayaca fluviatilis Aubl.: A, leaf (x4); B, leaf apex 
(X14); vb, vascular strand. . 
