Quercus ellipsoidalis |
Quercus emoryi |
|
---|---|---|
Hill's oak, Jack oak, northern pin oak |
bellota, Emory oak, Emory's oak |
|
Habit | Trees, deciduous, to 20 m; lower trunk often with stubs of dead branches. | Trees or shrubs, evergreen, to 15 m. Bark dark brown to black, deeply fissured. |
Bark | dark gray-brown, shallowly fissured, inner bark orangish. |
|
Twigs | dark reddish brown, (1-)1.5-3 mm diam., glabrous. |
dark reddish brown, 1-3 mm diam., pubescent. |
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 ovate to narrowly oblong to obovate, planar, 28-95 × 15-45 mm, base cordate, margins entire or spinose, with up to 13 awns, apex blunt to acute; surfaces abaxially glabrous except for tuft of tomentum on each side of midrib at base of blade, rarely completely glabrous, adaxially not rugous, glabrous or with a few hairs along midrib. |
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; cup cup-shaped, 5-7.5 mm high × 7-12 mm wide, covering 1/4-1/2 nut, outer surface pubescent to sparsely puberulent, inner surface pubescent to floccose, scale tips appressed, blunt; nut ellipsoid to oblong, 10-18 × 6-10 mm, glabrous to puberulent, especially at apex, scar diam. 3-5.5 mm. |
Terminal | buds dark reddish brown, ovoid, 3-5 mm, often conspicuously 5-angled in cross section, usually silvery- or tawny-pubescent toward apex. |
buds reddish brown, ovoid to subconic, 2.5-6.5 mm, glabrous except for tuft of hairs at apex, occasionally hairy on distal 1/2. |
Quercus ellipsoidalis |
Quercus emoryi |
|
Phenology | Flowering spring. | Flowering spring. |
Habitat | Dry sandy sites, rarely on moderately mesic slopes or uplands | Foothills and slopes |
Elevation | 150-500 m (500-1600 ft) | 1000-2200 m (3300-7200 ft) |
Distribution |
IA; IL; IN; MI; MN; OH; WI; ON
|
AZ; NM; TX; n Mexico
|
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.) |
Quercus emoryi reportedly hybridizes with Q. graciliformis (= Q. ×tharpii C. H. Muller). (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. Lobatae |
Sibling taxa | ||
Synonyms | Q. ellipsoidalis var. kaposianensis | Q. hastata |
Name authority | E. J. Hill: Bot. Gaz. 27: 204, plates 2, 3. (1899) | Torrey: in W. H. Emory, Not. Milit. Reconn., 151, plate 9. (1848) |
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