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Published In: Enumeratio Plantarum Horti Botanici Berolinensis, . . . 549. 1809. (Enum. Pl.) Name publication detailView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 9/22/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Native

 

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18. Rubus flagellaris Willd. (northern dewberry)

Map 2516

Canes to 250(–450) cm long and 60 cm tall, 3–6 mm in diameter. Prickles moderate to dense, (2)3–5 per cm of cane, (2–)3–4 mm long. Petioles with nonglandular hairs, armed with downward-curved prickles to 3 mm long. Stipules 14–18 mm long, linear to linear-lanceolate or narrowly elliptic. Primocane leaves mostly with 5 leaflets, rarely with 3, margins coarsely, doubly, and sharply toothed, the upper surface glabrous, the undersurface thinly hairy, often with small prickles on the veins. Primocane central leaflets 6–9 cm long and 4–7 cm wide, broadly ovate to ovate-elliptic, occasionally obovate, especially in late-season growth, cordate to rounded at the base, shouldered to an abruptly tapered, sharply pointed tip, the leaflet stalk about 1/4 as long as the leaflet blade; middle leaflets elliptic-obovate, angled at the base, short-tapered to a sharply pointed tip, short-stalked; basal leaflets elliptic, angled at the base, angled to a sharply pointed tip, sessile. Inflorescences 9–22 cm long, with 1–6 flowers on long, ascending stalks, with 2–6 leafy bracts, these mostly simple or mostly with 3 leaflets; flower and inflorescence stalks nearly glabrous, with small downward-curved prickles. Sepals 6–8 mm long, 3–4 mm wide, narrowly elliptic to triangular-elliptic, abruptly tapered to a short, slender point. Petals 12–20 mm long, obovate. Fruits 10–20 mm long, 10–15 mm wide, globose to broadly oblong in outline. 2n=28, 35, 49. May–June.

Scattered nearly throughout the state, more abundantly south of the Missouri River (northeastern U.S. west to Wisconsin and Oklahoma). Openings of mesic to dry upland forests, upland prairies, banks of streams, tops of bluffs, and margins of sinkhole ponds; also pastures, old fields, old mines, cemeteries, railroads, roadsides, and open, disturbed areas.

Palmer and Steyermark (1958) published the name R. flagellaris f. roseoplenus E.J. Palmer & Steyermark based on a specimen collected by Palmer (59655) in 1955 along a railroad in Barton County. This form was stated to differ from the typical one in its doubled corollas with numerous pinkish-tinged petals. However, the type specimen instead appears to represent an unusual plant of sect. Arguti (although the specimen is incomplete and thus cannot be determined to species with confidence).

 


 

 
 
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