442 NATURAL HISTORY OF PLANTS. 



are free except in a variable extent of the lower part, and the 

 anthers are bilociilar, introrse, dehiscent by two longitudinal clefts. 

 The gynœceum is composed of three ovaries, almost or completely 

 independent, from whose base rises a style, or more rarely two or 

 three (unequal in that case), whose stigmatiferous apex is more or 

 less dilated. In the internal angle of each ovary is found a placenta 

 supporting a descendent anatropal ovule with superior micropyle, 

 finally lateral. The fruit is formed of one to three samarse, whose 

 backs are surmounted by a vertical wing, analogous to those of 



Jannsln r/tinyaniticn. 



,,^/^■vW,^. 





Fig. 451. Flower (*). 



^jki/^'K.i^, 



Fie. 452. r.r,n!ritn'linal section of flower. 



Banisteria (fig. 439), and whose cavity contains a bent seed, with 

 ventral hilum, coats thin covering a fleshy embryo, superior short 

 radicle, and thick cotyledons usually unequal. Schvannia consists 

 of climbing shrubs; five species Miave been distinguished, na'ives 

 of troi^ical Brazil. The leaves are opposite, and the flowers are 

 arranged in small umbelliform cymes, often qiiadrifloriate, generally 

 collected in compound terminal clusters. 



Janusia (fig. 4.51, 452) is allied to Schivannia ; the petals are 

 entire, and the stamens, ten in number, may all be fertile ; but it also 

 happens that one or a small number of them remain sterile. The 

 fruit is also formed of two or three samarre. But the most re- 

 markable fact observed in this genus, and which will be found in 

 all those following it, is, that beside the normal flowers, there are. 



' Griseb. JAnnaa, xiii. 188 {Fimbrinria) ; 

 Mart. m. Bras. Maliiigh. 101, 102, t. 221 

 (Janusia). — Qiiisbb. Parlf. Siirr. -rii. Bnf. 



Rrp. 9, t. 1.— Walp. Rep. v. 353; -Ann. vii. 

 470. 

 - Red. 



