BIGNONIACE^. 



241 



II. Mentanthe^. Corolla induplicate. 



9. LIMNANTHEMUM. GweZ.— Limnanthemum. 

 <From the Greek \invas^ inhabiting a lake, and avOEjxov, a flowe' ) 



Calyx 5-parted. Corolla rotate, 5-parted ; the lobes bearded 

 or scaly at base and furnished with glands. Stamens 5. An- 

 thers erect. Style short or none. Stigma 2-lobed, persistent. 

 Capsule 1 -celled, few-seeded. 



L. lacunosum Griseb^ : floating ; leaves reniform-cordate, obscurely cre- 

 nate, smoothish above, spongy beneath ; segments of the calyx ovate-ob- 

 long, one-third as long as the corolla. (Z>, C.) Villarsia lacunosa Pursh. 

 Metiyatvthes trachysperma Mich. 



Ponds and lakes. Can. to Car. July, Aug. %.—Stem long, filiform, rooting 

 in the mud. Leaves about an inch long, on elongated petioles, somewhat fleshy, 

 greenish above and mostly purplish and spongy belovi^. Flowers wliite, fascicu- 

 iate, on peduncles produced from the petiole about half an inch below the leaf. 

 Abundant in Sand Lake, N. Y. Floating Heart. 



10. MENYANTHES. I/iww.— Buckbean. 



(From the Greek urivn^ the moon, (a month,) and avdo^, a flower ; because the 

 plant continues in flower about that time. Eaton.) 



Calyx 5-parted. Corolla funnel-form; limb spreading, 5- 

 lobed, equal, hairy within. Stamens 5, Style 1, filiform. 

 Stigma 2-lobed, persistent. Capsule 1 -celled, with the axis 

 of the valves seminiferous. 



M. trifollata Linn. 



Marshes. Subarct. Amer. to Virg. W. to the Rocky Mountains. May. %.— 

 Plant 8—12 inches high. Root creeping. Leaves temate, on long petioles 

 which are sheathing at base ; leafets obovate, nearly entire. Peduncles scape- 

 like, longer than the leaves. Flowers pale red, in a terminal raceme. 



Buckbean. Marsh Trefoil. 



Order LXXXII. BIGNONIACE^.— Bignoniads. 



Calyx divided or entire, sometimes spathaceous. Corolla 

 usually irregular, 4 — 5-lobed. Stamens 5, unequal, always 1, 

 sometinSs 3, sterile; when 4 are fertile, they are didynamous. 

 Ovary seated in a disk, 2-celled, or spuriously 4-celled. Style 

 1 ; stigma of 2 plates. Capsule 2-celled, sometimes spuriously 

 4-celled, 2-valved. Seeds transverse, compressed, often winged, 

 without albumen. — Trees or shrubs, often twining or climbing. 

 Leaves opposite, rarely alternate, without stipules. Flowers 

 somewhat panicled. • 



11 



