Arctostaphylos glandulosa subsp. crassifolia is a rare perennial shrub, a subspecies of manzanita within the heather family commonly known as the Del Mar manzanita. It is narrowly endemic to the sandstone coastal terraces of San Diego County and northwestern Baja California. It is a burl-forming evergreen shrub typically found growing in a rambling habit on poor soils and hardpan. From December to February, white to pink urn-shaped flowers decorate its foliage, giving way to small fruits. It is listed as endangered and is threatened by land development, invasive species and modifications to the natural fire regime.
No narrative description available for this taxon yet.
A DNA barcode is a short, standardised stretch of genes that works like a fingerprint — enough to tell one species from another. Below is the molecular trace Arctostaphylos glandulosa has left across the world's sequence archives.
At a glance
DNA specimens21
Marker genes4
GenBank sequences6
eDNA detections10
Countries1
The DNA barcodea real sequence read deposited for this species
★ the standard DNA barcode for this group — the short region actually read to tell this species apart. The rest are extra genes sequenced along the way.
★matK★rbcLa★ITS6★ITS2
plant barcodefungal barcode
06Genome at a glanceCCDB
The complete instruction manualArctostaphylos glandulosa carries — its genome. We read it from three angles — how big it is, how the DNA is packed into chromosomes, and how completely it has been sequenced — and explain how to read each value as you go.
Chromosomes & ploidyhow the DNA is packaged
2n is the full chromosome count in a normal body cell; n is a gamete (egg or sperm), which carries half. Ploidy is how many complete chromosome sets each cell holds — 2× (diploid) is typical for animals, while higher levels (polyploidy) are common in plants. Click any value below to see the underlying records and sources.
Chromosomes2n = 52 n = 26
Ploidypolyploid inferred
Chromosome-count records — grouped by value · 2n = full set, n = gamete · click a value for sources & references
2n 521×CCDB · eflora
CCDB · eflora
n 263×CCDB · book-ipcn67-71
CCDB · book-ipcn67-71 — WELLS, P.V. 1968. New taxa, combinations, and chromosome numbers in Arctostaphylos (Ericaceae). Madrono 19: 193-224.
Ploidy records — measured levels and diploid/polyploid inferences · click for sources
How far back this lineage goes — and how we know. Everything here is measured in Ma, short for “mega-annum”: millions of years ago. The chart reads left to right like a calendar of the Earth, from the deep past on the left to today at the right edgetop to bottom like a core drilled through the Earth, from the deep past at the top down to today at the bottom.
At a glance
DNA clock origin1.35 Ma TimeTree
When this lineage existed
How to read this: the coloured strip along the bottomdown the left is the geological calendar — the standard epochs (Pliocene, Pleistocene…) every museum uses, shown so you can see which chapter of Earth's history this lineage lived in. This lineage is a young one, so the strip is zoomed in to epochs — the finer subdivisions inside a period. The orange marker is the DNA clock: DNA accumulates mutations at a roughly steady rate, so comparing this species' DNA with its relatives estimates when the lineage split off — independently of any fossil.
DNA clock origin
08Occurrence & distribution
Record type3 429 records
Wild obs. + sensor2 033
Museum / vouchered1 396
Origin
Native16
Range
Area of Occupancy AOO4 276 km²
Wildobservation + sensor
Human sightings and records, or camera-trap / sensor detections — someone (or a device) saw or captured the species in the wild.
Coordinate accuracy91% within 1 km
≤100 m 1 198≤1 km 165≤10 km 72>10 km 64
1 499 georeferenced · 534 without coordinates
Open the mapobservation + sensor2 033
Museum / Voucheredphysical evidence
Backed by a physical specimen — a herbarium sheet, sample or voucher held in a collection. “Vouchered” means supported by material evidence, not just an observation.
Coordinate accuracy72% within 1 km
≤100 m 45≤1 km 723≤10 km 287>10 km 10
1 065 georeferenced · 331 without coordinates
Open the institutions mapphysical evidence1 396
Wildobservation + sensor
Human sightings and records, or camera-trap / sensor detections — someone (or a device) saw or captured the species in the wild.
10Collections & institutions
Holding institutions42 of 51 geolocated
Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.
Institution
Specimens
Claremont, US
803
Riverside, US
143
Davis, US
76
San Diego, US
63
Arcata, US
40
Santa Barbara, US
24
Wuzhou, CN
21
US
20
Angwin, US
14
Ensenada, MX
13
San Luis Obispo, US
12
Los Angeles, US
12
EL PASO, US
12
Severin-McDaniel Insect Collectionlocation not on record
11
CASlocation not on record
10
Bronx, US
10
Long Beach, US
9
DOI/NPS, Little Rock Central High School National Historic Sitelocation not on record
8
Northridge, US
8
Santa Cruz, US
6
Madison, US
6
University of Stellenboschlocation not on record
5
Chongqing Museumlocation not on record
5
Saint Louis, US
5
Irvine, US
4
Austin, US
4
Canadian Department of Agriculturelocation not on record
4
Bloomington, US
3
Logan, US
3
Provo, US
3
San Jose, US
3
Jena Microbial Resource Collectionlocation not on record
2
New Brunswick, US
2
Phoenix, US
2
Flagstaff, US
2
Mexico City, MX
2
Fullerton, US
2
Denver, US
1
Frankfurt am Main
1
La Paz, MX
1
San Bernardino, US
1
ASUlocation not on record
1
Fort Bragg, US
1
Chadron, US
1
San Angelo, US
1
Victoria, CA
1
Philadelphia, US
1
Vancouver, CA
1
Arizona State University Biocollectionslocation not on record
1
Bangkok, TH
1
St. Paul, US
1
51 institutions · 1 386 of 1 396 vouchered records shown · 10 without an institution code
09Environmental DNA10 detections
Where the DNA of Arctostaphylos glandulosa was picked up in samples of water, soil or air — nobody saw the organism, only its DNA left behind. A trace is a clue that the species was near, not a confirmed sighting.
Signal
Detections DNA found10
Studies independent surveys1
Countries1
Signal confidence: weakweighed across independent studies, places & mapped detections
Where its DNA was found
0 of 10 detections have coordinates
Open the map1 country0
Chaparral with Adenostoma fasciculatum, Cean…Oak Woodland/Chaparral with Quercus agrifoli…chaparral, burned (Pines Fire 2002)|N-facing…Chaparral with Arctostaphylos glandulosa ssp…
How strong is each trace?
DNA read depthRead counts were not reported for this species — the map shows presence only, not how strong each trace was.
Modelled climatemodelled
−15°Ctemperature across detection sites+40°C
Temperature median16.7 °C 15.0–23.2
Seasonal swing summer↔winter14.7 °C
Max temp (day)24.2 °C 21.1–31.7
Min temp (night)10.9 °C 8.90–15.6
Precipitation11.4 mm/mo 7.60–26.3
Air humidity55.4 % 48.8–58.9
Moisture balance-142 mm/mo -204–-96.7
Vapour deficit839 Pa 718–1,510
Wind speed2.80 m/s 1.70–4.00
Cloud cover26.5 % 19.5–29.4
CHELSA 1981–2010, ~9 km grid, at location & month of 6 detection points · median with p10–p90 · reflects where sampling happened, not only the true niche
How to read this: each dot is one detection of this species' DNA in an environmental sample. The confidence meter weighs how many independent studies and places back up the signal — one detection in one study is a hint; many across several studies is solid. Records dated before 2008 (when eDNA methods began) are treated as likely mislabeled and left off the map.
WikipediaWikimedia Foundation2 languages↗
BioWikiNetmultilingual Wikipediamultilingual↗
GBIFGlobal Biodiversity Information Facility3 429 records↗
ENAEuropean Nucleotide Archive · EMBL-EBI10 eDNA detections↗
BOLD SystemsCentre for Biodiversity Genomics21 specimens↗
NCBIUS National Library of Medicinesequences↗
GRIN TaxonomyUSDA-ARSdistribution & uses↗
Open Tree of LifeOpenTreephylogeny backbone↗
CCDBChromosome Counts DB · Tel Aviv U.genome & karyotype↗
PloiDBPloidy Databasegenome & karyotype
GLoBIGlobal Biotic Interactionsbiotic interactions↗