Systematik und Pflanzeugeographie. 303 



20. Weder Oxalatkrystalle im Mesophyll, noch Raphidenzellen 



Rhapidophyllum Wendl. et Dr. 



— Oxalatkrystalle im Mesophyll oder Raphidenzellen oder beides 



vorhanden Trachycarpris Wendl. 



F. v. Tavel (Zürich). 



Robinson, Descriptions of new plants, chiefly Gamo- 

 petalae, collected in Mexico by C. G. Pringle in 1889 

 and 1890. (Proeeedings of the Amer. Acad. of arts and 

 science. Vol. XXVI. p. 164—176.) 



Verf. beschreibt folgende neue Arten (resp. Varietäten) : 



Xylosma Pringlei, Desmodium Jaliscanum Wats. var. (?) ohtusum; Pimpi- 

 nella Mexicana; Eupatoriiini espinosarum Gray var. subintegrifolium; Gymnolomia 

 decumbens ; Otapappus alternifolius ; Senecio Guadalajarensis; Laurentia ovati- 

 folia; Lobelia novella; Nemacladus oppositifoliwt ; Symplocos Pringlei; Gonolobus 

 parviflorus Gray var. brevicoronatus ; Buddleya Chalapana; Cordia Pringlei; 

 Heliotrojiium Pringlei; Omphalodes acuminata; Bassovia Mexicana; Withania (?) 

 melanocystis ; Herpestis auriculata ; Gerardia punctata; Cantilleia rnacrostigma ; 

 Justicia Pringlei; Citharoxylum Berlandieri; Scutellaria hisjidula; Mimvlus 

 ■Congdonii, M. gracilipes ; Aster Engelmanni Gray var. (?) paucicapitatus. 



Taubert (Berlin). 



Watson, Sereno, Contribution to American botany. 

 XVIII. (Proc, of the Amer. Acad. of arts and science. Vol. 

 XXVI. p. 123—163.) 



1 . Descriptions ofsome new North American spe- 

 cies, chiefly ofthe United States, with a revision of 

 the American species of the genus Erythronium. 



Verf. beschreibt folgende neue Arten: 



Arabis Macounii, Erysimum arenicola, Sileve Macounii, Mimuhts (Eumimulus) 

 ßlicaulis, Cladolhrix crypfantha, Eriogonum (Ganysma) minutiflorum, E. deserti- 

 cola, Zoster a Oregona, Z. Pacifica. 



Die Gattung Erythronium zeigt in den Vereinigten Staaten 



•von Kordamerika ihre reichste Entwicklung. Verf. nimmt 13 Arten 



an, die, da die Unterscheidungsmerkmale stark variiren, schwierig 



auseinander zu halten sind und vom Verf. in folgender Weise 



gruppirt werden : 



* Eastern species. Corm small (6 to 9 lines long), oblong-ovate, often propagating 

 by lengthened offshoots, but also producing new corms niore or less fre- 

 quently at the base of the old: scapes low, 1-flowered: inner petals not 

 crested : capsule obovate (mostly 5 to 9 lines long). 



f Offshoots produced from the base of the corm. — 



1. E. Americanum Ker. ; 2. albidum Nutt. ; 3. mesoschoreum Knerr; 

 ff Offshoots produced trom the sheathed portion of the scape. — 



4. E. propullans Gray. 

 ** Western species. Corms usually elongated, rarely if at all propagating by 

 offshoots (except in n. fi), the new corms borne upon a short rhizome: scapes 

 often tall, 1-several-flowered: inner petals auricled and transversely crested 

 at base (except in n. 14) with four prominent gibbosities : capsule oblong, 

 attennate below. 



t Stigmas at lenglh distinct and recnrved. 



§ Leaves not mottled (or rarely ?) : flowers bright yellow. 



5. E. grandiflorum Pursh. et var. parviflorum Wats 



(= E. Nuttallianum Regel). 



