542 ORDER CXXXTI. PONTEDKRTAGK2B. 



Genus VII— STREPTOPUS. Mich. 6—1. 

 (From streptos, twisted, and pous, foot, from the twisted flower-stalks.) 



\Perianth 6-partecl, revolute, campanulate, with nectariferous 

 pores at the base. Stamens 6. Style 1. Fruit baccate, sub- 

 globose, 3-celled, few-seeded. 



1. S. ro'seus, (Mich.) Stem erect, glabrous, dichotomous. Leaves 

 oval, acuminate, clasping, many-nerved. Flowers axillary, solitary, 

 small, on nodding peduncles. — Rose-colored. If. May — June. Mount- 

 ain?. 12 — 18 inches. Hekorima dichotonta. 



2. S. lanugino'sus, (Mich.) Stem hoary, erect, branching. Leaves ses- 

 sile, ovate, acuminate, somewhat cordate, 5 — 7-nerved, pubescent. Pe- 

 duncle* at the summit of the branchlets, 2-flowered. Flowers on long 

 pedicels. Fruit red. — Greenish-purple. If. Mountains. Pennsylva- 

 nia to Carolina. Prosartes lanuginosa, Don. 



Genus VIII.— VERATRIJM. 6—3. 

 (From vere atrum, truly black ; in allusion to the color of the stem.) 



Perianth 6-parted, expanding, the segments sessile, without 

 glands. Stamens 6, inserted on the receptacle. Style 3, short. 

 Capsule oblong, 2-valved, many-seeded. 



1. V. vir'ide, (Ait.) Stem erect. Leaves large, sheathing at the 

 base, plaited, oval. Flowers in paniculate racemes. Bracts of the 

 branches oblong-lanceolate ; partial ones longer than the sub-pubescent 

 peduncles. Segments of the perianth oblong-oval, acute. — Greenish- 

 yellow. 2f . July. Mountains. 3 — 6 feet. 



2. V. r/ARViFLo'ituM, (Mich.) Leaves oval-lanceolate, flat, glabrous. 

 Flowers in slender, expanding panicles. Segments of the perianth acute 

 at each end, bearing the stamens. — Green. 2f. July. Mountains. 

 2 — 3 feet. Zygadenus monozcus, Gray. 



3. V. angustifo'lium, (Pursh.) Flowers dioecious, in simple panicles. 

 Segments of the perianth linear ; leaves very long, linear, keeled. — 

 Greenish-yellow. 2f . June. Mountains. 3 — 4 feet. 



Stenanthium angustifolium, Gray. 



Order CXXXII.— PONTEDERIA'CE^E. 



Perianth tubular, colored, 6-parted, more or less irregular, 

 (estivation circinate. Stamens 3 or 6, unequal, perigynous. 

 Ovary superior, 3-celled, many-seeded. Style 1. Stigma sim- 

 ple. Capsule 3-celled, 3-valved, dehiscence loculicidal. Seeds 

 numerous, orthotropous. Placental central. Aquatic plants, 

 with leaves sheathing at the base. Flowers spathaceous. 



Genus I.— PONTEDE'RIA. L. 6—1. (Pickerel Weed.) 

 (In honor of Julius Pontedcra, of Padua.) 



Perianth inferior, 6-parted, bilabiate, the under side of the 

 tube perforated with 3 longitudinal foramina, lower part per- 

 sistent. Stamens 6, unequally inserted. Capsule 3-celled. 



