SAX1FRAGACEJE. 



329 



Fig. 371. 

 Flower (^). 



Fig. 372. 

 Fruit (f). 



almost wholly superior ; and the stamens are much exserted (fig. 371). 

 The two carpels are very unequal, and the placentas are relegated right 

 down to the base of the ovary. 1 The capsule opens broadly above, 

 gaping into two very unequal 



l i /£ or,i\ Tiarella cord/folia. 



membranous valves (rig. 6(2). 

 Of the five known species, 2 

 one comes from the Hima- 

 layas, the rest from North 

 America. They have a per- 

 ennial rhizome, alternate 

 leaves, and flowers in simple 

 or ramified terminal racemes. 



j5o///////<2 s may be considered 

 as Saxifraga with an inferior 

 ovary, and with the androceum is reduced to the five alternipetalous 

 stamens. Five species are known,' all perennial herbs from North 

 America, with their organs covered with glandular hairs ; their leaves 

 are alternate, with setaceous stipules, and the flowers form terminal 

 racemes of cymes. 5 



Sullivantia ohioensis 6 has also small flowers, closely analogous to 

 those of the Saxifrages, with only five alternipetalous stamens. But 

 the receptacle is shallow, lodging only the lower part of the ovary ; 

 this divides above into two distinct bodies. Hence the fruit is a 

 half-superior capsule ; it contains numerous scobiform seeds. The 

 plant is a perennial herb from North America, with alternate leaves 

 and flowers in di- or trichotomous cymes. 



Ore-si trojjhe montana' is, like Chrysosplenium, an apetalous Saxifrage 

 with pentamerous flowers, and an androceum which is at least 



1 The carpels are like two little rolled up leaves, 

 prolonged into cornets cleft on the inside. The 

 receptacle forms a shallow obconical cup. The 

 tetragonal basifixed anthers open laterally. 



2 Hook., Fl, Bor.-Amer., i. 238, t. 77, 81.— 

 Toee. & Geat, Fl. N.-Amer., i. 587. — A. Geat, 

 Man., ed. 2, 145. — Chapm., Fl. S. Unit. States, 

 lb4.—Bot. Mag., t. 15S9.— Walp., Bep., ii. 372 

 (part.). 



3 Xutt., in Journ. Acad. Philad., vii. 113. — 

 Exdl., Gen., n. 4632 1 .— B. H., Gen., 636, u. 8. 



4 Toee. & Geat, Fl. N.-Amer., i. 576.— 

 Walp., Rep., ii. 362. 



5 Next to this genus comes, doubtfully, Boh 

 andra califomica A. Geat (in Proc. Amer. 

 Acad. (1867), vii. 341), which has pentamerous 

 flowers, with perigynous persistent petals, five 

 stamens, and a two-celled ovary, surmounted by 

 two short styles. This genus appears at once 

 allied to Tellima, Tolmiea, and Tiarella. 



6 Toee. & Geat, in Sillim. Journ., xlii. 22, 

 not. — A. Geat, C'/dor. Bor.-Amer., 38, t. 6; 

 Bot. N. Unit. St., 144.— B. H., Gen., 636, n. 9. 



7 Btjnge, Fwrnn. PI. Chin. Bor., 31. — Endl., 

 Gen., n. 4646.— B. H„ Gen., 639, n. 17.— 

 Walp., Rep., v. 828. 



