308 Systematik und Pflanzengeographie. 



nämliche Thema (A revision of the North-American species of the 

 genus Cracca) behandelt hatte. Ihre Eintheilung ist in erster Linie 

 auf Länge und Dichte der Inflorescenz aufgebaut, auf Charaktere^ 

 die viel zu veränderlich und verschwommen sind, um als Ein- 

 theilungsprincipien zur Verwendung kommen zu können. Verf. 

 scheint einen glücklicheren Griff zu thun, wenn er seine Eintheilung 

 auf den sympodialen bezw. monopodialen Aufbau des 

 Stammes gründet. Auch die Abgrenzung der Arten bei Vail 

 wird vom Verf. einer ziemlich abfälligen Kritik unterzogen. Eine 

 Uebersicht über die nordamerikanischen Arten mag hier auszugs- 

 weise mitgetheilt werden. 



§ I. Brissonia DC. Stern monopodial: Kacemes terminal or axillary, uever 

 opposite the leaves: flowers (in our species) lar^e, with petals 

 1 — 1,7 cm long. — Prodr. II. p. 249 in part. ; Taubert in Engler 

 et Prantl Nat. Pflanzenfam. III. Äbth. 3. p. 269. Brissonia Necker 

 Elem. III. p. 36. 



* Pods glabrous at maturity : racemes loose : southwestern 



T. leiocarpa Graz. 



* Pods permaneutly pnbescent or puberulent: inflore>cence short 

 and dense. 



+- Calyx-lobes ovate-lanceolate to lanceolate: pubescent gray t 

 petioles rarely 6 mm in length T. virginiana Pers. 



-t-+- Calyx lobes very narrow. almost filiform: pubescence 

 tawny. 



-f- Petioles 1,7 to 4,2 cm long: leaflets oblong: south- 



western T. leueantha H. B. K. 



+ + Petioles 4 to 17 mm long: leaflets nbovate: Florida 



T. Bugelii Kuttlew. 

 § II. Reineria DC. Stern sympodial, the main axis at one or more nodes 

 terminating in a raceme which by the strong development of an 

 axillary bud at its base becomes apparently lateral: some of the 

 racemes thus appear tho arise opposite the leaves. (The sympodial 

 structure is tardily developed in T. pvrpurea, which dnring its first 

 reason sometiii.es produces only a terminal raceme.) Reineria Mnch., 

 Meth. Suppl. 44. 



* Flowers large : petals 1 to 1,7 cm long. 



+- Leaflets (with rare exceptions) excedirg the short petioles- 

 -j- Flowers not numerous, born siugly or in pairs at 

 the nodes of the racemes. 



= Stern covered at least below with a short 

 dense bronze - colored tomentum: leaflets 

 thickish, of firm or coriaceous texture, 

 glabrous and finely reticnlate above: 



a) Leaves prostrate, essentially sessile : 

 leaflets seldom more than 7 



T. chrysophylla Pursh. 



b) Leaves, at least in some cases, ascending 

 petiolate; leaflets mostly 7 to 1 1 



T. Sma'lii n. comb. 

 = = Sterns very slender, sparingly pubescent: 

 leaflets rather small, elliptical, thiu 



T. hispidula Pers. 



= <= = Sterns rather shont, covered with a copious 



coarse tawny spreading pubescence; leaflets 



sparingly villous alony the midnerve above 



or appressed pubescent over the entire upper 



surface T. villosa Pers. 



-\ — \- Flowers numerous, the middle ones born in threes 



and fours: leaflets also numerous, 9 to 27, linear- 



oblong, 2,6—3 — 8 cm in length 



T. onobrychoide» Nutt. 



