Jepson eFlora: Taxon page
Vascular Plants of California
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Amelanchier alnifolia var. semiintegrifolia

Higher Taxonomy
Family: RosaceaeView DescriptionDichotomous Key
Common Name: ROSE FAMILY
Habit: Annual to tree, glandular or not. Leaf: simple to palmately or pinnately compound, generally alternate; stipules free to fused (0), persistent to deciduous. Inflorescence: cyme, raceme, panicle, cluster, or flowers 1; bractlets on pedicel ("pedicel bractlets") generally 0--3(many), subtended by bract or generally not. Flower: generally bisexual, radial; hypanthium free or fused to ovary, saucer- to funnel-shaped, subtending bractlets ("hypanthium bractlets") 0--5, alternate sepals; sepals generally 5; petals generally 5, free; stamens (0,1)5--many, anther pollen sacs generally 2; pistils (0)1--many, simple or compound, ovary superior to inferior, styles 1--5. Fruit: 1--many per flower, achene (fleshy-coated or not), follicle, drupe, or pome with generally papery core, occasionally drupe-like with 1--5 stones. Seed: generally 1--5 (per fruit, not per flower).
Genera In Family: 110 genera, +- 3000 species: worldwide, especially temperate; many cultivated for ornament, fruit, especially Cotoneaster, Fragaria, Malus, Prunus, Pyracantha, Rosa, Rubus. Note: Number of teeth is per leaf or leaflet, not per side of leaf or leaflet, except in Drymocallis.
eFlora Treatment Author: Daniel Potter & Barbara Ertter, family description, key to genera, treatment of genera by Daniel Potter, except as noted
Scientific Editor: Daniel Potter, Thomas J. Rosatti.
Genus: AmelanchierView DescriptionDichotomous Key

Habit: Shrub, small tree. Stem: bark gray- to red-brown; overwintering buds ovate to lanceolate, +- red to +- purple. Leaf: simple, deciduous; stipules deciduous. Inflorescence: raceme, cluster (panicle), flowers 3--16+; pedicel bractlets generally 1--2. Flower: hypanthium bell- to urn-shaped, bractlets 0; sepals persistent; petals erect to spreading, white (suffused with red); stamens +- 10--20; ovary inferior, 2--5-chambered, styles 2--5. Fruit: pome of 2--5 papery segments, berry-like, generally spheric, generally blue-black.
Etymology: (Latin: from old French common name) Note: Fruit of some species used by Native Americans for food.
Unabridged Note: Variation in Amelanchier in western North America not studied as extensively as in eastern North America, where hybridization, polyploidy, and apomixis have contributed to considerable taxonomic complexity (Campbell & Wright 1996 Folia Geobot Phytotax 31:345--354;
eFlora Treatment Author: Christopher S. Campbell
Unabridged Reference: Jones 1946 Illinois Biol Monogr 20:1--126
Species: Amelanchier alnifoliaView Description 

Stem: twigs glabrous. Leaf: blade elliptic to round, generally serrate above middle, glabrous in fruit. Flower: petal ovate to +- round; styles 4--5.

Amelanchier alnifolia (Nutt.) Nutt. ex M. Roem. var. semiintegrifolia (Hook.) C.L. Hitchc.
Habit: Plant 1--12 m. Leaf: blade 30--40 mm, 20--30 mm wide, abaxially finely or occasionally densely hairy in flower. Inflorescence: 4--8 cm; flowers 5--15. Flower: petal 12--15 mm; ovary top generally hairy. Fruit: 10--13 mm diam. Chromosomes: 2n=68.
Ecology: Open conifer or mixed-evergreen forest, slopes; Elevation: 50--2500 m. Bioregional Distribution: NCo, KR, n NCoRO; Distribution Outside California: to Alaska. Flowering Time: Mar--Jun
Unabridged Synonyms: Amelanchier florida Lindl.
Jepson eFlora Author: Christopher S. Campbell
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Botanical illustration including Amelanchier alnifolia var. semiintegrifolia

botanical illustration including Amelanchier alnifolia var. semiintegrifolia

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Citation for this treatment: Christopher S. Campbell 2012, Amelanchier alnifolia var. semiintegrifolia, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on April 14, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora,, accessed on April 14, 2024.

Amelanchier alnifolia  
var. semiintegrifolia
click for enlargement
©2008 George W. Hartwell
Amelanchier alnifolia  
var. semiintegrifolia
click for enlargement
©2008 George W. Hartwell
Amelanchier alnifolia  
var. semiintegrifolia
click for enlargement
©2008 George W. Hartwell
Amelanchier alnifolia  
var. semiintegrifolia
click for enlargement
©2008 George W. Hartwell
Amelanchier alnifolia  
var. semiintegrifolia
click for enlargement
©2010 Vernon Smith

More photos of Amelanchier alnifolia var. semiintegrifolia
in CalPhotos

Geographic subdivisions for Amelanchier alnifolia var. semiintegrifolia:
NCo, KR, n NCoRO
1. You can change the display of the base map layer control box in the upper right-hand corner.
2. County and Jepson Region polygons can be turned off and on using the check boxes.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).


Data provided by the participants of the  Consortium of California Herbaria.
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).