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Published In: Flora Caroliniana, secundum . . . 235. 1788. (Fl. Carol.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 8/18/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Native

 

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17. Quercus lyrata Walter (overcup oak)

Pl. 417 d, e; Map 1855

Plants trees to 20 m tall. Bark light ashy gray, divided into loose plates. Twigs 2.0–3.5 mm wide, brown or gray, glabrous or with scattered spreading hairs. Buds grayish brown, 2–4 mm long, finely and minutely pubescent. Petioles 3–27 mm long. Leaf blades 11–24 cm long, 8.0–12.5 cm wide, relatively thin and flexible, usually acutely angled or tapered at the base, sometimes rounded-obtuse, divided 60–80% of the width, the lobes 3–5(6) per side, the sinuses often much shallower in the apical half of leaf; well-developed lobes 11–42 mm wide, ovate or oblong, sometimes broadened outward, acute to broadly rounded apically, sometimes with 1 or 2 teeth or secondary lobes on each margin; secondary veins 3–7 per side, some reaching the margin at the tips of the lobes, usually others reaching toward sinuses and turning aside before reaching the margin; the upper surface dull or somewhat shiny, glabrous or with scattered, single or paired hairs, the undersurface green or white, usually with scattered, 1–4-rayed, spreading hairs, sometimes with appressed-stellate hairs and with appressed unbranched hairs, usually felty to the touch. Acorn stalks 5–33 mm long, the cup (17–)21–31 mm long, (9–)18–21 mm wide, broadly urn-shaped to nearly globose, covering most or all of the nut, the outer surface with the scales 3–5 mm long, those near the cup margin much narrower. Nuts 9–20 mm long, 14–28 mm wide, broadly top-shaped. April–May.

Scattered in the southeastern quarter of the state, west locally to Taney County (southeastern U.S. west to Missouri, Oklahoma, and Texas). Bottomland forests, swamps, sloughs, banks of streams, and rarely sinkholes.

When the undersurface of the leaf is densely covered with stellate hairs, it appears white. If the stellate hairs are sparse or absent, the leaf is green on both sides. The green form has been called f. viridis Walter. Hybrids have been recorded with three other oak species in Missouri.

 


 

 
 
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