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Juniperus horizontalis Moench
Life   Plantae   Gymnospermae   Cupressaceae   Juniperus

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Associates · map
FamilyScientific name @ source (records)
Agaricaceae  Phoma @ 355848A (1); 355848C (1); 355848D (1); 355848B (1)
Diaspididae  Acutaspis morrisonorum @ AMNH_PBI (1)
Dothioraceae  Kabatina juniperi @ BPI (1)
Lasiosphaeriaceae  Endophragmiella boewei @ BPI (1)
Miridae  Aoplonema princeps @ AMNH_PBI (3)

Bolteria luteifrons @ AMNH_PBI (1); NCSU_ENT (2)

Coridromius chenopoderis @ AMNH_PBI (1)

Dichrooscytus alpinus @ AMNH_PBI (2)

Dichrooscytus elegans @ AMNH_PBI (1)

Dichrooscytus repletus @ AMNH_PBI (1)

Dichrooscytus ruberellus @ AMNH_PBI (14)

Gn_orthotylinigp14 sp_001 @ AMNH_PBI (1)

Gn_orthotylinigp5 sp_007 @ AMNH_PBI (1)

Myrtlemiris yalgoo @ AMNH_PBI (1)

Parthenicus juniperi @ AMNH_PBI (1)
Patellariaceae  Eutryblidiella sabina @ BPI (1)
Pucciniaceae  Gymnosporangium clavipes @ BPI (1)

Gymnosporangium connersii @ BPI (1)

Gymnosporangium corniculans @ 122473A (1); BPI (24)

Gymnosporangium globosum @ BPI (1)

Gymnosporangium juvenescens @ BPI (10)

Gymnosporangium nelsonii @ BPI (1)

Gymnosporangium nidus-avis @ BPI (9); 122473B (1)

Gymnosporangium tubulatum @ BPI (1)

Gymnosporangium @ BPI (5)
Sarcoscyphaceae  Pithya cupressina @ BPI (2)
Stereaceae  Aleurodiscus cerussatus @ BPI (1)
_  Roestelia brucensis @ BPI (7)

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Following modified from Flora of North America
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FNA | Family List | FNA Vol. 2 | Cupressaceae | Juniperus

3. Juniperus horizontalis Moench, Methodus. 699. 1794.

Creeping juniper, savinier, genévrier horizontal

Juniperus horizontalis var. douglasii hort.; J . horizontalis var. variegata Beissner

Shrubs dioecious, prostrate to decumbent; crown depressed. Bark brown, exfoliating in thin strips, that of small branchlets (5--10 mm diam.) smooth, that of larger branchlets exfoliating in wide strips or plates. Branches creeping; branchlets erect, 3--4-sided in cross section, ca. 2/3 or less as wide as length of scalelike leaves. Leaves green but turning reddish purple in winter, abaxial gland elliptic, conspicuous, exudate absent, margins entire (at 20´ and 40´); whip leaves 4--8 mm, not glaucous adaxially; scalelike leaves 1.5--2 mm, mostly overlapping to 1/3 their length, apex rounded or obtuse to acute and apiculate, spreading. Seed cones mostly maturing in 2 years, of 2 distinct sizes, generally with curved peduncles, globose to ovoid, 5--7 mm, blue-black to brownish blue when mature, lightly glaucous, soft and resinous, with 1--2(--3) seeds. Seeds 4--5 mm. 2 n = 22.

Sand dunes, sandy and gravelly soils, prairies, slopes, rock outcrops, and stream banks; 0--1000 m; St. Pierre and Miquelon; Alta., B.C., Man., N.B., Nfld., N.W.T., N.S., Ont., P.E.I., Que., Sask., Yukon; Alaska, Ill., Iowa, Maine, Mass., Mich., Minn., Mont., Nebr., N.H., N.Y., N.Dak., S.Dak., Vt., Wis., Wyo.

Juniperus horizontalis , a prostrate species, hybridizes with the trees J . virginiana and J . scopulorum (R. P. Adams 1983; N. C. Fassett 1945; M. Palma-Otal et al. 1983) and is closely related to both. The hybrid between J . horizontalis and J . scopulorum has been named J . ´ fassettii Boivin.

Updated: 2021-06-13 21:45:50 gmt
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