ONAGRARIACEsE. 



463 



All the Œnotheras whose flower and fruit have the essential 

 characters of Onagra have been ranged in a section Eiuenothera. 1 

 Those called Meriolix* (Œ. serrulata) have a 

 little shorter receptacular tube and a stigma Œnothera spedosa. 



dilated in the form of a disk. The petals are 

 not entire. In Megapterium 5 (Œ. macrocar- 

 pa, missouriensis), the receptacle is dilated 

 around the fruit in large and thick vertical 

 wings. 4 Taraxia 5 (Œ. ovata, Nuttallii, etc.) 

 has also sometimes (Œ. graciliflora) winged 

 fruit. The receptacular tube is long and 

 slender ; the stigma is capitate, the fruit ses- 

 sile and the stem very short. Cratericar- 

 pium 6 (Œ. subulata) has the characters of 

 the preceding sections, with a 4-dentate 

 stigma, stamens with small anthers and fruit Fig. 430. Flower, 



dilated at the summit. Hartmannia 7 (Œ. 



rosea, tetraptera), like Cratericarpium , is from South America. The 

 fruit is often enlarged above, and the stigma is deeply divided into 

 four lobes. The seeds are contained in distinct cavities of the 

 pericarp. 



Boisduvalia s and Godetia, by some distinguished as genera, have 

 been, by others, referred to this type as simple sections. In the 

 former, the receptacle rises above the ovary forming a funnel-shaped 

 cup the height of which is nearly that of the ovary itself. In Godetia, 9 

 this open portion is shorter and especially extends a less distance 

 downwards. 10 In both the extremity of the style is divided into 



1 Torr. et Gr. Fl. N.-Amcr. i. (1840) 492.— 

 Wats. Proc. Amer. Acad. viii. (1873) 574, 579 

 (incl. : Onagra T. loc. cit. — Anogra Spath, Nouv. 

 Ann. Mus. iv. 323, Zii.—Kneiffia Spach, Nouv. 

 Ann. Mus. iv. 364; Suit, à Buffon, iv. 373. — 

 Pachylophis Spach, Nouv. Ann. 3-56, t. 30 ; Suit. 

 365. — Xylopleurum Spach, Nouv. Ann. iv. 369 ; 

 Suit. iv. 369. — Lavauxia Spach, N. Ann. 357, t. 

 31 ; Suit. 367 (.part, ex Wats. loc. cit. 585).— 

 Baumannia Spach, Suit. 351). 



2 Rafin. Aiiut. Monthl. Mag. [1819] exENHL. 

 Gen. 1190. — Calylophis Spach, N.Ann. Mus. iv. 

 337.— Calylophus Spach, Suit, à Buffun, iv. 366. 



3 Spach, Nouv. Ann. Mus. iv. 350 ; Suit, à 

 liuffnn, iv. 363. 



4 They recall in form and consistence a great 



number of Comhretacete with winged fruit. 



5 Nutt. ex Torr. et Gr. Fl. N. Amer. i. 506. 

 — Wats. he. cit. 588, 605. — Primulopsis Torr. 

 et Gr. loc. cit. 507. 



6 Spach, Nouv. Ann. Mus. iv. 397. 



" Spach, Nouv. Ann. Mus. iv. 397 ; Suit, à 

 Bufou, iv. 370. 



8 Spach, Nouv. Ann. Mus. iv. 327, t. 31 ; Suit, 

 à Buffon, iv. 383. — Endl. Gen. n. 6118. — Wats. 

 loc. eit. 578, 600. 



9 Spach, Nouv. Ann. Mus. iv. 326, t. 39 ; Suit, 

 à Buffon, iv. 386.— Wats. loc. cit. 577, 596; 

 Geol. Sun: Calif. Bot. i. 221. 



10 By this character, Godetia is intermediate 

 between Boisduvalia and Sphœrostigma, and ap- 

 pears, consequently, inseparable from either. 



