Quercus lobata |
Quercus pagoda |
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California white oak, roble, valley oak |
cherrybark oak, Texas oak |
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Habit | Trees, deciduous, to 25(-35) m, usually with solitary trunks. | Trees, deciduous, to 40 m. Bark nearly black with narrow and noticeably flaky ridges, often resembling that of wild black cherry, inner bark orange. |
Bark | gray, scaly, deeply checkered in age. |
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Twigs | yellowish, gray, occasionally reddish, 2-4 mm diam., densely or sparsely tomentulose. |
yellowish brown, 2-3.5 mm diam., pubescent. |
Buds | yellowish or light brown, ovoid, (2-)3-5(-6) mm, apex occasionally acute, densely pubescent. |
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Leaves | blade broadly obovate or elliptic, moderately to deeply lobed, (40-)50-100(-120) × 30-60(-75) mm, base rounded-attenuate, cuneate, or truncate, rarely subcordate, margins with sinuses usually reaching more than 1/2 distance to midrib, lobes oblong or spatulate, obtuse, rounded, or blunt, secondary veins 5-10 on each side, apex broadly rounded; surfaces abaxially whitish or light green, densely to sparsely covered with interlocking appressed or semi-erect, 8-10(-14)-rayed stellate hairs, adaxially dark green or grayish, glossy or somewhat scurfy because of sparse stellate hairs. |
blade ovate to elliptic or obovate, 90-300 × 60-160 mm, base cuneate to rounded or truncate, margins with 5-11 lobes and 10-25 awns, lobes oblong, rarely falcate, terminal lobe rarely exceeding lateral lobes in length, apex acute; surfaces abaxially pale, tomentose, adaxially glossy, glabrous, secondary veins raised on both surfaces. |
Acorns | solitary or paired, subsessile; cup deeply cup-shaped, hemispheric or turbinate, rim thick, 10-30 mm deep × 14-30 mm wide, scales grayish or cream, more acute near rim, strongly and irregularly tuberculate, especially toward base of cup; nut light brown, oblong or fusiform, 30-60 × (12-)15-25 mm, tapering to acute or rounded apex. |
biennial; cup saucer-shaped to cup-shaped, 3-7 mm high × 10-18 mm wide, covering 1/3-1/2 nut, outer surface puberulent, inner surface pubescent, scale tips tightly appressed, acute; nut subglobose, 9-15 × 8-16 mm, often striate, puberulent, scar diam. 5-9 mm. |
Cotyledons | distinct. |
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Terminal | buds light reddish brown, ovoid, 4-9 mm, strongly 5-angled in cross section, puberulent throughout. |
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Quercus lobata |
Quercus pagoda |
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Phenology | Flowering late winter–early spring. | Flowering spring. |
Habitat | Valley floors and moderate slopes, open grasslands, savannah and oak woodlands, riparian areas in chaparral | Poorly drained bottoms and mesic slopes |
Elevation | 0-1700 m (0-5600 ft) | 0-300 m (0-1000 ft) |
Distribution |
CA
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AL; AR; FL; GA; IL; IN; KY; LA; MO; MS; NC; OK; SC; TN; TX; VA
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Discussion | Mature trees of Quercus lobata are among the largest oaks of the United States. The species hybridizes with numerous other species, but the hybrids are not common in most parts of its range. On Santa Cruz and Santa Catalina islands, however, occur extensive and relatively stable populations that show intermediate characteristics with Q. pacifica (see treatment). The hybrids have been given the name Q. ×macdonaldii, and they differ from Q. lobata in the following: leaf sinuses reaching less than half the distance to the midrib; leaves usually smaller, the lobes often more acute and brighter green; and acorns smaller, with more acute apices. The Yuri used Quercus lobata in the treatment of diarrhea (D. E. Moerman 1986). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Quercus pagoda is often treated as a variety of Q. falcata; it is quite distinctive, however, both morphologically and ecologically (S. A. Ware 1967; R. J. Jensen 1989). This species reportedly hybridizes with Q. falcata and Q. phellos (D. M. Hunt 1989). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Fagaceae > Quercus > sect. Quercus | Fagaceae > Quercus > sect. Lobatae |
Sibling taxa | ||
Synonyms | Q. hindsii, Q. lobata var. hindsii, Q. longiglanda | Q. falcata var. leucophylla, Q. falcata var. pagodifolia, Q. leucophylla, Q. pagodifolia |
Name authority | Nee.: Anales Ci. Nat. 3: 277. (1801) | Rafinesque: Alsogr. Amer., 23. (1838) |
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