350 ORDER 52. ONAGRACE^E. 



capsule globular, 2 to 4-celled, many-seeded. (T) In wet places. Sts. 

 square and Ivs. opposite, entire. Fls. axillary. 



1 A. humilis MX. St. branched from the lose, ascending ; Ivs. linear-oblong, or 

 lanceolate, obtuse, tapering at base into a short petiole ; fls. solitary, closely sessile, 

 all the parts in 4s ; sty. very short. An obscure and humble plant in wet places, 

 Conn, to Ga., W. to Oreg. Sts. square, procumbent at base, 6 to 10' high. Fls. 

 minute, with 4 purplish, caducous petals. A variety has the leaves somewhat 

 dilated at base, approaching the next species. Aug., Sept. (Ammannia ramo- 

 eior L.) 



2 A. latifolia L. St. erect, branching ; Ivs. linear-lanceolate, acute, dilated and au- 

 riculated at the sessile base ; fls. crowded, and apparently verticillate, upper subsol- 

 itary and pedunculate ; cal. 4-angled, 4-horned ; sep., pet, stam. and cells of cap- 

 sule 4. Wet prairies, W. States to La, St. 1 to 2f high. Lvs. 2 to 3' by 2 to 5". 

 Pis. purple. Jl. Sept. (A. ramosior L.) 



6. HYPOBRICH'IA, Curtis. Calyx 4-lobed, without accessory teeth ; 



petals 6 ; stamens 2 to 4 ; ovary 2-celled; stigma 2-lobed, subsessile ; 



capsule globous, bursting irregularly, many-seeded. A. submersed, 



aquatic herb. Lvs. opposite, crowded, linear. Fls. axillary, sessile, 



minute. (Didiplis Raf.) 



H. Nuttallii Curt. A little inhabitant of ponds and sluggish streams, 111. (Mead, 

 Buckley) to N. Car. and La. Its habit is similar to a Callitriche. St. mostly sub- 

 mersed, 10 to 2' long. Lvs. 10 to 15" by 1 to 2", very numerous. Jn. Aug. 

 (Peplis diandra Nutt.) 



OKDER LIT. ONAGRACE^E. ONAGRADS. 



Herbs rarely shrubs, with the flowers 4 (sometimes 2 or 3)-merous, with the calyx 

 tube adhering to the 2 to 4-celled ovary, and teeth valvate in the bud ; the petals 

 convolute in the bud, sometimes obsolete as well as the calyx teeth. Stamens as 

 many or twice as many as the petals or calyx teeth ; ovary 1 to 2 to 4-celled, styles 

 united, and stigmas capitate or 4-lobed; fruit capsular or baccate, 2 to 4-celled, 

 seeds with little or no albumen. Illust. in Figs. 116, 311, 403, 417. 



Two Suborders are comprehended under this Order, viz : the Onagracese proper or Epilobieae, 

 nncl Halorageae. The latter are aquatic herbs of low grade, reduced Epilobes, the flowers being 

 imperfect or reduced to solitary organs. Both together contain 38 genera&ml 520 species, par- 

 ticularly abundant throughout America, more rare in the Old World. 



They possess no remarkable properties. Many of them are ornamental, as the genus Fuchsia, 

 Clarkia, etc. 



SUBORDERS AND GENERA. 



I. EPILOBIEJ3. Flowers perfect and complete (sometimes apetalous in Ludwigia) 2-parted 



or 4-parted. Pollen connected by cobwebs. (*) 



II. IIALOBAGEJ3. Flowers incomplete and often imperfect, small and greenish, 1, 3, and 



4-parted. Plants aquatic, often submersed, (c) 



* Stamens 8 (or twice as many as the petals), (a) 



* Stamens 4 or 2, as many as the petals or sepals, (b) 



a Calyx tube not prolonged beyond the ovary. Seeds comous..EpTLOBiUM. 1 



Seeds glabrous.. JUSSKEA. 2 



a Calyx tube prolonged, the free summit slender. Seeds GO.. .(ENOTHEUA. 3 



slender. Seeds 1 to 4.GAURA. 4 



short. Petals clawed. CLARKIA. 5 



long and enlarged FUCHSIA.' 6 



b Flowers 4-parted, perfect, sometimes apetalous. . LUDWIGIA. 7 



b Flowers 2-parted, perfect and complete CIUC-EA. 8 



C Flowers 3-parted, perfect, apetalous. PROSEBPINACA. 9 



C Flowers 4-parted, msncecious, petals 4 or 0. Submersed..*. . .MYKIOPHYLLUM. 10 



C Flowers 1-parted, perfect, apetalous HIPPURIS. 11 



1. EPILO'BIUM, L. WILLOW HERB. ROSE BAY. (Gr. fai, upon, 

 s , a pod, lov, a violet ; i. e., a violet growing upon a pod.) Calyx 



