3 RR a aa MISS A 
SAGITTARIA AND LOPHOTOCARPUS. 63 
Plate 20, S. graminea cycloptera.—1, Plant, one-half natural size; 2, 
achenium; 3, cross section of achenium; 4, stamen; 5, bracts, X 2. 
Plate 21, S. graminea Chapmani. —1, Plant, one-third natural size; 2, 
achenium; 3, stamen; 4, bracts, natural size. 
Plate 22, 9. cristata Engelm.—1, Plant, one-third natural size; 2, 
achenium, lateral and 3, dorsal view, 4, cross-section; 5, stamen, ripe and 
6, effete. 
Plate 23, S. macrocarpa. —1, Plant, one-half size; 2, achenium; 3, 
stamen. 
Plate 24, S. teres S. Wats. —1, Plant, one-half size; 2, stolon, natural 
size; 8, achenium, lateral view and 4, in cross section; 5, stamen. 
Plate 25, S. papillosa Buch.—1, Plant, one-fourth size; 2, achenium; 
8, stamen; 4, bracts, X 6. 
Plate 26, S. platyphylla (Engelm.)— 1, Plant, one-half size; 2, ache- 
nium; 3, stamen; 4, fruiting scape, one-half size; 5, 6, leaves, one-half 
size. 
Plate 27, S. Mexicana Steudel.—1, Plant, one-third natural size; 2, 
immature achenium; 38, stamen from bud; 4, stamen. 
Plate 28, S. Sanfordii Greene.—1, Plant, one-third natural size; 2, 
achenium; 3,stamen; 4, leaf, one-half natural size. 
Plate 29, S. Montevidensis Cham. and Schl.—1, Plant, one-fourth 
natural size; 2, achenium, lateral view and 8, cross-section; 4, stamen; 
5, staminate flower, one-half natural size. 
37 
