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Arbutus menziesii Pursh
PACIFIC MADRONE
Life   Plantae   Dicotyledoneae   Ericaceae   Arbutus

Arbutus menziesii, whole tree or vine - general
© Copyright Steve Baskauf, 2002-2011 · 4
Arbutus menziesii, whole tree or vine - general

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Arbutus menziesii, bark - of a large tree
© Copyright Steve Baskauf, 2002-2011 · 4
Arbutus menziesii, bark - of a large tree

Arbutus menziesii, bark - of a large tree
© Copyright Steve Baskauf, 2002-2011 · 4
Arbutus menziesii, bark - of a large tree

Arbutus menziesii, leaf - showing orientation on twig
© Copyright Steve Baskauf, 2002-2011 · 4
Arbutus menziesii, leaf - showing orientation on twig

Arbutus menziesii, leaf - whole upper surface
© Copyright Steve Baskauf, 2002-2011 · 4
Arbutus menziesii, leaf - whole upper surface

Arbutus menziesii, leaf - margin of upper + lower surface
© Copyright Steve Baskauf, 2002-2011 · 4
Arbutus menziesii, leaf - margin of upper + lower surface

Arbutus menziesii, twig - orientation of petioles
© Copyright Steve Baskauf, 2002-2011 · 4
Arbutus menziesii, twig - orientation of petioles

Arbutus menziesii, bark - of a medium tree or large branch
© Copyright Steve Baskauf, 2002-2011 · 4
Arbutus menziesii, bark - of a medium tree or large branch

Arbutus menziesii, bark - of a small tree or small branch
© Copyright Steve Baskauf, 2002-2011 · 4
Arbutus menziesii, bark - of a small tree or small branch

Associates · map
FamilyScientific name @ source (records)
Alcyoniidae  Rhytisma arbuti @ BPI (29)
Aleyrodidae  Aleuroparadoxus arctostaphyli @ CSCA_TCN (2)

Aleuropleurocelus @ CSCA_TCN (1)

Bemisia berbericola @ CSCA_TCN (2)

Tetraleurodes mori @ CSCA_TCN (3)

Trialeurodes bemisae @ CSCA_TCN (2)

Trialeurodes madroni @ CSCA_TCN (2)
Aphalaridae  Neophyllura arbuti @ CSCA_TCN (1)
Aphididae  Prociphilus ( @ AMNH_PBI (1)

Wahlgreniella nervata @ NCSU (1); CSCA_TCN (8)
Apidae  Bombus melanopygus @ EMEC (5)

Bombus vosnesenskii @ EMEC_JPS__JPS (2); BBSL__JPS (1)
Atheliaceae  Amylocorticium @ BPI (1)
Botryosphaeriaceae  Diplodia maculata @ BPI (10); 369644B (1)

Fusicoccum arbuti @ BPI (8)

Macrophoma maculiformis @ BPI (1)

Sphaeropsis maculiformis @ BPI (3)
Braconidae  Aphidius ( @ AMNH_PBI (2)

Lysiphlebus ( @ AMNH_PBI (1)
Chaetophoraceae  Trichodiscus prasinus @ BPI (1)
Coccidae  Parthenolecanium corni @ CSCA_TCN (3)
Dermateaceae  Mollisia cinerea @ BPI (1)
Diaspididae  Diaspidiotus hunteri @ CSCA_TCN (1)
Diatrypaceae  Diatrype prominens @ BPI (4)

Eutypa ludibunda @ BPI (1)
Dothideaceae  Dothidea rugodisca @ BPI (1)
Elsinoaceae  Sphaceloma mattiroloanum @ BPI (2)
Exobasidiaceae  Exobasidium vaccinii @ BPI (4)
Helotiaceae  Pestalopezia brunneopruinosa @ BPI (1)
Hyaloscyphaceae  Cistella granulosella @ BPI (2)

Dasyscyphus @ BPI (1)

Velutaria rufo-olivacea @ BPI (2)
Hymenochaetaceae  Hymenochaete tabacina @ BPI (2)
Hysteriaceae  Gloniopsis insignis @ BPI (1)

Gloniopsis praelonga @ BPI (1)

Hysterographium flexuosum @ BPI (1)
Leptosphaeriaceae  Coniothyrium asterinum @ BPI (1)
Lygaeidae  Thylochromus nitidulus @ AMNH_IZC (1)
Melanconidaceae  Harknessia arctostaphyli @ BPI (2)
Meruliaceae  Phlebia radiata @ BPI (1)
Miridae  Blepharidopterus provancheri @ AMNH_PBI (3)

Deraeocoris brevis @ AMNH_PBI (2)
Mycosphaerellaceae  Mycosphaerella arbuticola @ BPI (16); 607384B (1); 607384A (1)
Mymaridae  Alaptus @ UCRC_ENT (40)
Peniophoraceae  Peniophora laevis @ BPI (1)
Phanerochaetaceae  Phanerochaete velutina @ BPI (1)
Polyporaceae  Fomes carneus @ BPI (1)

Lenzites saepiaria @ BPI (1)

Polyporus biformis @ BPI (1)

Polyporus dichrous @ BPI (1)

Polyporus macounii @ BPI (1)

Polyporus versicolor @ BPI (2)

Poria ferrea @ BPI (2)

Trametes sepium @ BPI (3)

Trametes serialis @ BPI (2)
Pucciniastraceae  Pucciniastrum arbuti @ BPI (1)

Pucciniastrum sparsum @ BPI (35)
Rhytismataceae  Coccomyces arbutifolius @ BPI (2)

Coccomyces clusiae @ BPI (1)

Coccomyces dentatus @ BPI (1)

Melasmia arbuticola @ BPI (6)

Propolis faginea @ BPI (1)
Stereaceae  Aleurodiscus cerussatus @ BPI (1)

Aleurodiscus succineus @ BPI (1)

Stereum gausapatum @ BPI (1)

Stereum hirsutum @ BPI (4)

Stereum sulphuratum @ BPI (1)
Stictidaceae  Stictis arbutus @ BPI (1)

Stictis radiata @ BPI (7)

Stictis @ BPI (1)
Valsaceae  Valsa delicatula @ BPI (3)
Xylariaceae  Barrmaelia sustenta @ BPI (1)
_  Actinopelte dryina @ BPI (2)

Ascochyta hanseni @ BPI (6)

Ascochyta menziesii @ BPI (2)

Cryptostictis arbuti @ BPI (5)

Dendrophoma rhododendri @ BPI (2)

Didymosporium arbuticola @ BPI (7)

Disaeta arbuti @ BPI (1)

Euphyllura arbuti @ CSCA_TCN (1)

Hypochnus spongiosus @ BPI (1)

Macroplodia asterina @ 367157B (1); 367157A (1)

Monochaetia desmazieri @ BPI (1)

Platystomum compressum @ BPI (1)

Torula @ BPI (1)

Uredo arbuti @ BPI (1)

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FNA Vol. 8 Page 396, 398, 399 , 400 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 8 | Ericaceae | Arbutus

2. Arbutus menziesii Pursh, Fl. Amer. Sept. 1: 282. 1813.

Pacific madrone

Arbutus procera Douglas ex Lindley

Shrubs or trees, 4-10(-20) m; bark dark red, smooth, until mid season when outer bark exfoliates, inner bark green, soon weathering to dark red; following exfoliation on younger wood, bark retained on oldest portions of main axis and on abaxial sides of larger lateral axes, area of retained bark gradually increasing as tree ages, becoming roughened dark gray. Leaves larger on sterile shoots with longer internodes; petiole 2-4.5 cm, base slightly decurrent, glabrous, sometimes with hairs adaxially; blade glaucous-green abaxially, olive-green adaxially (leaves of previous season turning yellow and red in June and July before they fall), elliptic, 6.5-13 × 3.5-6(-8) cm, base usually rounded, sometimes slightly cordate, rarely tapered, apex usually rounded or acute, rarely with short cusp, surfaces glabrescent (sparingly hairy on newly emerging leaves). Inflorescences (often compound), congested or not; axes hairy ± throughout, hairs not glandular. Pedicels accrescent, initially pendulous, becoming stiffly erect, 3-5(-6.2) mm, (to 6-8 mm in fruit), sometimes sparsely glandular-hairy; bract clasping base, rust-colored, scalelike, 2-3.5 mm. Flowers: calyx creamy tan at anthesis, lobes 1-2.1 mm, apex blunt; corolla 4.9-5.8 mm; anthers 1-1.2 mm, spurs usually slightly exceeding length of thecae; ovary with 2-5 ovules per locule. Berries red or orange-red, 13-20 mm diam. Seeds 2-2.5 mm.

Flowering Mar-May(-Jun); fruiting (Jun-)Jul-Sep (-Oct) (fruit sometimes held on the trees into early part of following year). Open forests, rocky slopes, ravines, foothills, and shores; 0-1800 m; B.C.; Calif., Oreg., Wash.

References to the presence of Arbutus menziesii in the San Pedro Martír Mountains of northern Baja California have not been supported by vouchers. Its southernmost area of occurrence is in San Diego County, California, where it is rare. Its range extends northward along the coast to British Columbia (about 50° north latitude, in the vicinity of Seymour Narrows).

The smooth, red bark and its mid-season exfoliation mark Arbutus menziesii as a distinct species and one much sought as an attractive landscape tree. People who have acquired property with native individuals of the species already present are very lucky because transplants of young saplings for landscaping seldom succeed. Cultivation from seed seems to be successful.

Updated: 2020-08-05 20:18:01 gmt
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