K. Krause: Eine neue Loranthacee aus Zentralamerika. 



441 



subsimplex, vel ramis erectis vel adscendentibus, in plantis redundantibus, 

 permaturis interdum late divaricatis vestitus, lineis pubescentiae longi- 

 tudinalibus de foliis decurrentibus, praeterea glaber, 3—5 dm altus. 

 Folia anguste usque lineari-lanceolata, 5—10 cm longa, 5—10 mm lata, 

 ambobus extremitatibus angustata, sessilia, minutatim serrulata vel in- 

 tégra, marginibus ciliatis, praeterea glabra. Infiorescentia paniculata, 

 contracta. Involucrum 6—8 mm altum, 8 — 10 mm latum, bracteis eius 

 in 4 series dispositis, lanceolatis, acutis, cilio- et scarioso-marginatis, 

 praeterea viridibus. Flores radiati 25 — 85, 5 — 8 mm longi, pallide vio- 

 laceo-purpurei vel albi. Pappus sordide albidus. — Species easily con- 

 founded with this are A, lautus Lunell, which is best recognized by its 

 widely spreading inflorescence; A, salicifolius Lam., which has thickish- 

 broader leaves and the disk of the head 1 cm high and 1 cm broad, 

 and white pappus; A. longifolius Lam., which has the bracts of the in- 

 volucre glabrous, subequal, only the outermost sometimes shorter, and 

 pale pappus; and A, laetevirens Greene, which has rather few heads, 

 broader leaves, involucral bracts with white mid-rib, and outer bracts 

 broader than the inner. — North Dakota: This species has a predi- 

 lection for the margins of sloughs. The type specimen was collected 

 by the writer on September 6, 1910, in high grass around a slough, not 

 far from Leeds, Benson County. The plant is a representative of ad- 

 vanced autumn, often defying the night frosts until early October, and 

 surpassed in durability only by Brachy actis angustus. 



LXVIII. Eine neue Loranthacee aus Zentralamerika. 



Von K. Krause. 



(Originaldiagnose.) 



Phthirusa Pittierl Krause, spec. nov. 



Rami teietes modice validi cortice griseo vel brunneo-griseo laevi 

 vel hinc inde densiuscule lenticelloso obtecti. Foliorum petiolus supra 

 tota longitudine latiuscule canaliculatus basi pauUum incrassatus, 

 0,8 — 1,5 cm longus; lamina rigida coriacea anguste ovata vel ovato- 

 oblonga apice acumine angusto acuto interdum paullum obliquo, 

 1^5—1,8 cm longo praedita, basi rotundato-obtusa, 1,2—1,8 dm longa, 

 tertio vel quarto inferiore 5—9,5 cm lata, nervis lateralibus 7 — 10 

 supra prominulis subtus plerumque vix conspicuis angulo fere recto vel 

 superioribus angulo acuto a costa validiuscula supra impressa subtus 

 distincte prominente abeuntibus marginem versus arcuatim adscendentibus 

 percursa. Inflorescentiae spicatae circ. 6 — 8 cm longae, in axillis foliorum 

 plures collatérales. Flores dioici parvi brevissime pedicellati vel sessiles 

 in glomerulos paucifloros 0,8 — 1,5 cm longe remotos dispositi. Calyculus 

 brevis margine obsolete denticulatus. Tepala flavescentia vel in siccitate 

 atro-brunnea crassiuscula subcarnosa oblonga dimidio superiore paullum 



