I 



WATER-PLANTAIN FAMILY. g ? 



j. Lophotocarpus calycinus (Engelm.) J. G. Smith. Lophotocarpua. 



(Fig. 192.) 



agittaria calycina Engelm.; Torr. But. Mex. Bound. 



Surv. 212. 1859. 

 'jttohiocarpus calycinus Micheli in DC. Mono? Phan 



3:61. 1881. 



ophotocarpus calycinus J. G. Smith, Mem. Torr. Club 5- 



25- 1894- 



Annual, leaves floating or ascending, entire, has- 

 tate or sagittate, the basal lobes spreading, ovate, 

 acute or acuminate, the apex acute or obtuse, the 

 blade varying from i'-8' long, sometimes 12' wide at 

 the base. Scape simple, weak and at length decum- 



nt, mostly shorter than the leaves; verticils of 

 owers 1-5 ; bracts membranous, orbicular or ovate 

 and obtuse, or those of statniuate flowers lanceolate 

 nd acute ; fertile pedicels very thick, recurved in 

 fruit, equalling or longer than the slender sterile 

 ones ; petals 3 // -4 // long ; stamens hypogynous ; fila- 

 ments flattened, papillose, about as long as the an- 

 thers ; achene obovate, i" long, narrowly winged on 

 the margins, tipped with a short horizontal triangular 

 beak. 



In swamps, New Brunswick to Virginia and Louisiana, 

 across the continent to California, thus occurring nearly 

 throughout the United States. Foliage wonderfully van- 

 able in form. July-Sept. 



4. SAGITTARIA L,. Sp. PI. 993. 1753. 



Perennial aquatic or bog herbs, mostly with tuber-bearing or nodose rootstocks. fibrous 

 roots, basal long petioled nerved leaves, the nerves connected by numerous vein let*, 

 and erect, decumbent or floating scapes, or the leaves reduced to bladeles* pbyllodia 

 <figs. 197, 203). Flowers monoecious or dioecious, borne near the summits of the scape* 

 in verticils of 3*3, pedicelled, the staminate usually uppermost Verticils 3-bracted. 

 Calyx of 3 persistent sepals, those of the pistillate flowers reflexed or spreading in onr 

 species. Petals 3, white, deciduous. Stamens usually numerous, inserted on the convex 

 receptacle ; anthers 2-celled, dehiscent by lateral slits ; staminate flowers sometimes with 

 imperfect ovaries. Pistillate flowers with numerous distinct ovaries, sometimes with imper- 

 fect stamens ; ovule solitary ; stigmas small, persistent. Achenes numerous, densely aggre- 

 gated in globose or subglobose heads, compressed. Seed erect, curved ; embryo horseshoe- 

 shaped. [Latin, referring to the arrow-shaped leaves of some species.] 



About 25 species, natives of temperate and tropical regions. Besides the following, some to 

 others occur in the southern and western parts of North America. 



Fertile pedicels slender, ascending, not reflexed in fruit. 

 Leaf -blades sagittate. 



Basal lobes one-fourth to one-half the length of the blade. 

 Beak of the achene more than one-fourth its length. 

 Beak of the achene erect. 



Fruiting pedicels shorter than the bracts : k-avi-s broad. 

 Fruiting pedicels longer than the bracts ; leaves narrow 

 Beak of the achene horizontal or oblique. 

 Beak of the achene less than one-fourth its length. 



Petioles rather short, curving ; bracts long ; bog species. 

 Petioles elongated ; bracts short ; aquatic spn it- 

 Basal lobes two-thirds to three-fourths the length of the blade. 

 Leaves entire, or rarely hastate or cordate. 



Filaments slender, tapering upward ; leaves seemingly pinnatcly M m 

 Filaments glabrous ; bracts connate. 

 Filaments cobwebby-pubescent ; bracts mostly distinct 

 Filaments abruptly dilated, pubescent ; veins distinct to the base of t 

 Fruiting heads sessile or very nearly so. 

 Both staminate and pistillate flowers pedicelled. 



Leaves reduced to terete nodose phyllodia, rarely blade-beannv: 



10 



ngirotfr*. 

 Entftm+mm 



3. S. 



4. S. r>/u/M. 



5. & fmitfata. 



6. 5. lo*gilo* 



Leaves rigid, blades elliptic-linear. 



Leaves not rigid ; blades lanceolate or linear-oblong. 

 Fertile pedicels stout, reflexed in fruit ; filaments dilated. 

 Filaments pubescent ; leaf-blades ovate or ovate-elliptic. 

 Filaments glabrous ; leaves linear-lanceolate or reduced to pnyllc 



it. i" 



i a. S. gntmimt*. 



13. S. 



14. S. 



