Systematik und Pflanzengeographie. 239 



a,. Bark not sliaggy; outer scales of terminal buds soou deciduous; 

 husk of medium thickness, not parted quite to the base; nut 

 angular but not much broader than thick. 



6. C. tomentosa Nutt. {H. alba [L.] Britton). 



b. Bark shaggy ; outer bud scales persistiug through the winter ; 

 nut augular ard flattened from the side. 



a. Fruit broader thau long ; husk moderately thick, not parted 

 to the base. 



7. C. Mexicana Engelmann. 



ß. Fruit subglobose or ellipsoidal ; husk very thick, completely 

 .«eparating into 4 pieces ; nut rather thin shelled, the kerne! 

 lurge and sweet. — In this group many of the petioles 

 remain adherent to the twigs during the winter. 



8. C. sidcata Nutt. {U. laciniosa [Michx.] Sargent). Fruit ellipsoidal, 

 2 — 2'/2 inches long; husk finely velvety pubescent; nut longer 

 adherent thau broad, yellow ; shell about 2 mm thick. 



9. C. alba Nutt. {H. ovata [Miller] Britton). Fruit subglobose, about 

 IV2 inches long; husk glabrous ; nut nearly one half smaller 

 than in the last, typirally scarcely louger than broad, nearly white ; 

 shell 1 mm. 



Der Verf. überspringt die Artnummer 6 ; ob eine Art aus- 

 gelassen ist? 



Jiifßlans L. 



* Leaf scars little notched at top, siirraounted by a yellow-velvety trans- 

 verse prominence. 



1. J, cinerea L. 



** Leaf scars evidentiy notched, not surmounted by a tomeutose elsvation; 

 nut subglobose, somewhat 4-celled at base. 

 t Western species ; terminal buds elongated, their outer scales lobed 



above ; fruit mostly small, the nut often only shallowly grooved and 



then with smooth rounded ridges. 



2. J. rupestris Eugelmaun. A shrub or small tree ; twigs slender ; 

 pith very small; terminal buds twice as long as broad; nut often 

 erosely roughened. 



3. /. Califormca. Watson. A small or medium sized tree; twigs 

 stouter; pith large ; terminal buds somewhat less elongated; nut 

 less deeply grooved. 



tt Eastern ; terminal buds scarcely longer than broad, gray, their scales 

 usually not evidently lobed ; fruit large, the nut with prominent rough 

 and Sharp ridges. 



4. J. nigra L. 



Knoblauch (Giessen). 



Focke, W. O.f Bemerkungen über die Arten von Agri- 

 monia. (Abbandlungen herausgegeben vom Naturwissenschaft- 

 lichen Verein zu Bremen. Band XIV. 1897. Hett 2. p. 231 

 —234.) 



Im Gegensatz zu vielen anderen i?osaceen- Gattungen (wie 

 Rubus, Potentilla etc.) treten bei Agrimonia (auch bei Geiim u, a.) 

 die Arten vereinzelt und geographisch getrennt auf. Verf. g'.ebt 

 eine kurze Uebersicht über die Verbreitung und über einige 

 Merkmale. Er bittet um Material zum Studium der seltenen aus- 

 ländischen Arten. 



E. H. L. Krause (Thorn). 



