ORDER CV. SANTALACEiE. 493 



3. N. capita'ta, (Walt.) A small tree. Leaves on short petioles, ob- 

 long-lanceolate and oval, pubescent and hoary beneath. Sterile florets 

 numerous in compact heads; fertile florets solitary, on short peduncles. 

 Periayith toraentose. Fruit ovate, of a dull red-color, sour. — ^ . April 

 —May. Wet soils. 15—20 feet. 



4. X. tomento'sa, (Mich.) A tree. Leaves on long petioles, oblong- 

 acuminate, tomentose beneath, coarsely and acutely toothed. Fertile 

 florets solitary, pedunculate ; segments of the perianth cuneate. — ^ . 

 April — May. Southern Geo. 



5. N. uniflo'ra, (Walt.) A large tree. Leaves on long petioles, large, 

 ovate, oblong, acuminate, irregularly and acutely toothed, pubescent 

 beneath; the old leaves cordate. Fertile flowers solitary, axillary. 

 Fruit oval or ovate, dark-blue, large. — ^ . April — May. Deep swamps. 

 60—80 feet. 



Genus II.— HAMILTO'NIA. Rox. 20—5. 



(In honor of Mr. Hamilton, a botanist of Philadelphia.) 



Polygamous. Perfect flowers. Perianth turbinate, cam- 

 panulate, 5-cleft. Germ immersed in a 5-toothed, glandular 

 disk. Stamens 5. Style 1. Stigmas 2 — 3. Drupe inferior, 

 1-seeded, inclosed in the base of the perianth. 



1. H. oleif'era, (Muhl.) A shrub. Leaves oblong, obovate, entire, 

 acuminate, pubescent beneath, petiolate. Flowers in a terminal raceme, 

 small, greenish-yellow. Nut globular, depressed, 1-celled ; the whole 

 plant more or less oily. — ^ . May — June. Mountains. 4 — 6 feet. 



Oil-nut. Pyrularia oleifera, Mich, 



Genus III— THE'SIUM. L. 5—1. 

 (From thes, a servant, from the mean appearance of the plant) 



Flowers perfect. Perianth 4 or 5 cleft. Stamens 4 or 5, 

 opposite the lobes of the perianth, villous externally. Nut 1- 

 seeded, crowned by the persistent perianth. 



1. T. umbella'tum, (L.) Stem erect, glabrous, branching near the 

 6ummit. Leaves oblong, lanceolate, entire, alternate, mucronate. Flow- 

 ers in terminal panicles, sub-corymbed. Involucre 4deaved, small. 

 Perianth 5-cleft, with the upper half colored. — If.. July — Aug. Rocky 

 hdls. 8 — 12 inches. Comandra umbellata, Nutt. 



Genus IV.— DAR'BYA. A. Gray, 20—5. 

 (From J. Darby.) 



Flowers dioecious. Perianth simple, turbinate, 4 — 5-cleft. 

 Disk thick, attached to the tube of the perianth, margin with 

 4 — 5 curvatures. Stamens 4 — 5, opposite the lobes of the 

 perianth ; filaments short, subulate ; anthers 2-celled. Fruit 

 not known. 



1 D. umbella'ta. A shrub, smooth. Leaves opposite, membrana- 

 ceous, oval, margin entire, undulate, on short petioles, lighter on the 



