138 AMERICAN MIDLAND NATURALIST 



6. Rosa polyanthema sp. nov. 



Rami, recentes, floriferi et steriles, spinis rectis, deciduis, 

 neque longitudine admodum variabilibus, tenuissimis, setis baud 

 dissimilibus armati. Stipulae angustissimae, integrae, subtus 

 valde tomentosae, magis minusve glanduliferae, marginaliter 

 saltern. Rachis folii et petioluli dense albido-tomentosi, glandu- 

 liferae, marginaliter saltem. Rachis folii et petioluli dense 

 albido - tomentosi, glanduliferi, plerumque spinosi. Foliola 

 7-plerumque 9, in surculis recentibus validis saepe 11, ob- 

 longa vel obovata vel paene orbicularia, basi saepissime 

 cuneata, apice obtuso vel retuso vel acuto, 2.5-5 cm. longa, 

 i-5~3-5 c^- lata, petiolulata, serrata, dentibus procurvis, fere 

 glabrata superne, glauca, magis minusve tomentulosa, glandu- 

 losa etiam subtus, praesertim nervo med. ano. Flores corymbosi, 

 nunierosi (usque 33) vel solitarii. Sepala lanceolata, interne et 

 marginaliter albido-lanata,tergo et apic ibus longis glandulis 

 stipitatis hispida, exteriora pinnatifida. Receptaculum rubrum, 

 pomiforme vel pyriforme, glabrum, 2 cm. diametro. Achaenia 6 

 mm. longa. 



The young branches, flowering as well as sterile, covered with 

 a profusion of straight, deciduous prickles, not very variable in 

 length, very weak, being hardly more than bristles. Stipules very 

 narrow, entire, densely tomentose beneath, more or less glanduli- 

 ferous, at least on the margins. Leaf-rachis and petiolules densely 

 white-tomentose, glanduliferous, and usually prickly. Leaflets 

 7 — usually 9, on vigorous young shoots often 11, oblong, or obo- 

 vate, or nearly orbicular, mostly cuneate at base, apex obtuse, or 

 notched, or acute, 2.5-5 cm. long, 1.5-3.5 cm. wide, petiolulate, 

 serrate, with the teeth directed forwards, almost glabrate above, 

 glaucous and more or less tomentulose and even glandular beneath, 

 especially on the main nerve. Flowers corymbose, numerous 

 (even to 33) to solitary. Sepals lanceolate, white-woolly within 

 and on the margins, hispid with stipitate glands on the whole 

 back, including the long tips, the outer ones pinnatifid. Recep- 

 tacle red, pomiform or pyriform, glabrous, 2 cm. in diameter. 

 Achenes 6 mm. long. 



This rose, by far most exuberant among its allies, was collected 

 by the writer both in flower and fruit on August 23, 19 13 in alluvial 

 ground on the banks of the Missouri, not far from Bismarck, 

 Burleigh County. 



