Quercus ellipsoidalis |
Quercus laceyi |
|
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Hill's oak, Jack oak, northern pin oak |
lacey oak |
|
Habit | Trees, deciduous, to 20 m; lower trunk often with stubs of dead branches. | Trees, deciduous, to 5-8(-10) m. Bark light colored, papery or scaly. |
Bark | dark gray-brown, shallowly fissured, inner bark orangish. |
|
Twigs | dark reddish brown, (1-)1.5-3 mm diam., glabrous. |
gray, 1.5-2 mm diam., pubescent with erect stellate hairs, these soon shed, at maturity reddish and pruinose to tan and glabrous. |
Buds | brown, ovoid to ovoid-lanceoloid, 1.5-3 × 1-2 mm, apex acute, glabrous. |
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Leaves | blade elliptic, 70-130 × 50-100 mm, base obtuse to truncate, margins with 5-7 deep lobes and 15-55 awns, lobes distally expanded, sinuses usually extending more than 1/2 distance to midrib, apex acute; surfaces abaxially glabrous except for minute axillary tufts of tomentum, adaxially glossy light green, glabrous, secondary veins raised on both surfaces. |
blade blue-green, glaucous, obovate or elliptic, (20-)40-90(-210) × (20-)30-60(-110) mm, thin, base cuneate and decurrent on petiole to rounded or rarely somewhat cordate, margins thin, flat, entire to shallowly lobed or (rarely in shade forms) deeply lobed, lobes if present oblong, squarish, often retuse, secondary veins 6-9 on each side, each terminating in tooth or arching near margins, apex broadly rounded, retuse; surfaces abaxially whitish, with erect stellate hairs, hairs shed as leaves expand, becoming glabrous, glaucous, adaxially glabrous, glaucous. |
Acorns | biennial; cup narrowly turbinate to deeply cup-shaped, 6-11 mm high × 10-19 mm wide, covering 1/3-1/2 nut, outer surface reddish brown, puberulent, inner surface light brown, glabrous, rarely with ring of pubescence around scar, scales with straight or slightly concave margins, tips tightly appressed, obtuse or acute; nut ellipsoid to ovoid, rarely subglobose, 10-20 × 9-15 mm, occasionally striate, glabrous, occasionally with 1 or more faint rings of fine pits at apex, scar diam. 4-8 mm. |
annual, solitary or paired, subsessile or on short peduncle to 10(-20) mm in leaf axil; cup saucer-shaped or shallowly cup-shaped, 4-7 mm deep × 10-12(-18) mm wide, enclosing 1/3 nut or less, scales moderately tuberculate, finely tomentose; nut oblong or barrel-shaped, often flattened at both ends, (11-)13-15(-20) × 9-11(-14) mm. |
Cotyledons | distinct. |
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Terminal | buds dark reddish brown, ovoid, 3-5 mm, often conspicuously 5-angled in cross section, usually silvery- or tawny-pubescent toward apex. |
|
Quercus ellipsoidalis |
Quercus laceyi |
|
Phenology | Flowering spring. | Flowering in spring. |
Habitat | Dry sandy sites, rarely on moderately mesic slopes or uplands | Limestone hills, woodlands and riparian forests, canyons and streamsides |
Elevation | 150-500 m (500-1600 ft) | 350-2200 m (1100-7200 ft) |
Distribution |
IA; IL; IN; MI; MN; OH; WI; ON
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TX; Mexico (Coahuila and Nuevo León) |
Discussion | In many treatments (e.g., E. G. Voss 1972+, vol. 2), Quercus ellipsoidalis is included in Q. coccinea. Variation in fruit morphology has led to recognition of several formae (W. Trelease 1919; see also R. J. Jensen 1986) and one variety (Q. ellipsoidalis var. kaposianensis, based on specimens from St. Paul, Minnesota, in which the cup tightly encloses the nut for two-thirds its length at maturity). Quercus ellipsoidalis reportedly hybridizes with Q. rubra and Q. velutina. The Menominee used Quercus ellipsoidalis medicinally to treat suppressed menses caused by cold (D. E. Moerman 1986). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Material from Texas and northeastern Mexico, excluding the type, has been incorrectly referred to Quercus glaucoides M. Martens & Galeotti by some authors (K. C. Nixon and C. H. Muller 1992). On the Edwards Plateau of Texas, Quercus laceyi occurs mostly at 350-600 m elevation; in Coahuila and Nuevo León, it occurs at 1500-2200 m. This species is sometimes associated with remnant mesic forests, which include Acer grandidentatum Nuttall, Tilia species, Quercus muhlenbergii Engelmann, and various pine and other oak species. The leaves are shallowly lobed or entire, although occasional specimens on moist sites are deeply lobed and resemble the leaves of Q. alba in outline. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Fagaceae > Quercus > sect. Lobatae | Fagaceae > Quercus > sect. Quercus |
Sibling taxa | ||
Synonyms | Q. ellipsoidalis var. kaposianensis | Q. breviloba subsp. laceyi |
Name authority | E. J. Hill: Bot. Gaz. 27: 204, plates 2, 3. (1899) | Small: Bull. Torrey Bot. Club 28: 358. (1901) |
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