ramblinghobbit's Identifications

Link to the (red beetle) Rose Curculio (Merhynchites bicolor) observation: https://www.inaturalist.org/observations/218826904

California Wild Rose growing next to year round stream. Thick-at-the-base, recurved thorns on stem are distinctive.

COMPARISON of 3 Wild Roses (genus Rosa) found in Monterey County, CA: California Wild Rose (Rosa californica), Pine Rose (Rosa Pintorum), and Ground Rose (Rosa spithamea)
(There a 8 confirmed species of Rosa genus on INaturalist as of 5/13/24: https://www.inaturalist.org/observations?place_id=118063&quality_grade=research&taxon_id=53438&view=species)

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California Wild Rose (Rosa californica) Native, perennial, thicket-forming shrub in the Rose (Rosaceae) family that grows 8--25 dm (up to 8 ft) tall in generally +- moist areas, especially along streambanks in many California plant communities. Stem: prickles are relatively sparse (few to many), paired or not, 3--15 mm long, thick-based and compressed, and generally (re)curved. Single, older thorns at nodes along stem have a thick base and are recurved (unlike local Rosa woodsii and Rosa pinetorum that have spines that are not recurved, but are dense, straight, thin, with no thickness at the base.) Leaflets are pinnate, 5-7, +- hairy, sometimes glandular, and finely toothed along the margins. Flowers are often in clusters, each flower with 20–40 pistils. Sepals are "persistent" meaning they remain on the rose hip (fruit) after the pale pink petals have fallen off. Peak bloom time: May-June.

"Rosa californica which grows on the Monterey Peninsula, is thicket-forming, reaches 8–25 dm, and has compressed, generally curved prickles with thick bases. It generally favors moist areas, and is often found along streams. Flowering Period: May-June"
Endangered Species Fact Sheets (85+ species in Monterey County) www.elkhornsloughctp.org/factsheet/factsheet.php?SPECIES_ID=97

Calflora (includes species distribution map in CA): https://www.calflora.org/app/taxon?crn=7179

Jepson eFlora https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=41631

Field Guide: Wildflowers of California, California Native Plant Society, 2024 (easy descriptions, exc. color photos, 600+ pages), p. 449.

Flora of North America http://beta.floranorthamerica.org/Rosa_californica

Plants of Monterey County: an Illustrated Field Key, 2nd edition, Matthews and Mitchell, 2015, pp. 286-287.

Flora of Fort Ord: Monterey County, California, David Styer, 2019, p. 191.

Monterey County Wildflowers: a Field Guide, Yeager and Mitchell, p. 138.

Monterey County Wildflowers, Trees & Ferns https://montereywildflowers.com/rosaceae-rose/

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COMPARED TO

Pine Rose (Rosa Pintorum) is an Endemic, rare, petite plant in the Rose (Rosaceae) family that grows less than 39 inches tall. It is endemic to the closed-cone pine forests of the Central Coast ranges around Monterey Bay. It is a non-thicket forming, dwarf shrub in the Rose (Rosaceae) family that grows less than 10dm (less than 39 inches) tall in shaded Monterey Pine woodland. Spines on stem are dense and many, both slender and +- thick-based, and straight (not recurved). Peak bloom time: May-June.
Conservation Status: 1B.2 in California, US (CNPS) (Rare, threatened, or endangered in CA and elsewhere).

Illustration of the differences in Rosa foliage (including R. pinetorum) from Flora of North America (FNA): http://floranorthamerica.org/w/images/f/ff/FNA9_P12_Rosa_acicularis_subsp_sayi.jpeg

Endangered Species Fact Sheets: Global Distribution of Pine Rose (Rosa Pintorum) "Restricted to the central California coast. Known from coastal terraces on the Monterey Peninsula to Carmel Highlands (Monterey County), the mouth of Waddell Creek at Big Basin Redwoods State Park (Santa Cruz County), and possibly Cambria (San Luis Obispo County)"
Endangered Species Fact Sheets: http://www.elkhornsloughctp.org/factsheet/factsheet.php?SPECIES_ID=97

Native California Roses, by Barbara Ertter, 2001, Pine Rose (Rosa Pintorum): https://ucjeps.berkeley.edu/ina/roses/rosa_pinetorum.html

There are 43 records of this species listed in Monterey County (as of 5/12/24) on CalFlora by local botany legends like Vern Yadon, Dean Taylor, and David Styer.
Calflora https://www.calflora.org/entry/observ.html?track=m#srch=t&lpcli=t&taxon=Rosa+pinetorum&chk=t&cch=t&cnabh=t&inat=r&cc=MNT

Jepson eFlora: https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=41684
Pine Rose (Rosa Pintorum): Native, “dwarf shrub, openly rhizomed, generally < 10 dm. Stem: prickles many, not paired, 3--10 mm long, both slender and +- thick-based, and straight (not recurved). Leaf: axis glabrous or finely hairy, glandular; leaflets 5--7, glabrous to hairy; terminal leaflet 10--30 mm, generally +- elliptic, widest near middle, tip +- obtuse, margins +- single- or double-toothed, +- glandular. Inflorescence: generally 1--5-flowered; pedicels generally 10--30 mm, glabrous, glandular or not. Flower: hypanthium generally +- 4 mm wide at flower, glabrous, glandless, neck +- 3 mm wide; sepals generally +- glandular, entire, tip generally +- = body, entire or toothed; petals +- 15--20 mm, pink; pistils +- 10--20. Fruit: +- 12 mm wide, spheric; sepals +- erect, persistent; achenes 3--4 mm. Ecology: Pine woodland; Elevation: generally < 300 m. Flowering Time: May--June" https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=41684

Monterey County Wildflowers https://montereywildflowers.com/rosaceae-rose/
"This is a small, rare rose. Like Wood Rose (Rosa gymnocarpa), it has smaller flowers than California Rose (Rosa californica), and prickles that are straight and slender. The flowers are a little larger than Wood Rose (petals 15–20 mm long), usually pink to red, and with more numerous (10–20) pistils. The hypanthium is also broader, 4 mm wide at the base of the petals. Leaflets are generally no more than 7 in number. Its sepals are persistent, meaning they remain on the hip as it matures. "
Monterey County Wildflowers https://montereywildflowers.com/rosaceae-rose/

"Stems with straight, slender prickles, some thick-based. . . sepals persistent in fruit"
Plants of Monterey County: an Illustrated Field Key, 2nd edition, Matthews and Mitchell, 2015, pp. 286-287.

Monterey County Wildflowers: a Field Guide, Yeager and Mitchell, 2016, p. 139.

Coastal California's Living Legacy: The Monterey Pine Forest, 2nd. ed, Nikki Nedeff, et. al. The Monterey Pine Forest Watch, 2018

Flora of Fort Ord: Monterey County, California, David Styer, 2019
(species not listed--no pine forests)

Endangered Species Fact Sheets (85+ species in Monterey County) http://www.elkhornsloughctp.org/factsheet/

Link to confirmed California Wild Rose (Rosa Californica) for comparison: https://www.inaturalist.org/observations/99542621

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Ground Rose (Rosa spithamea) A.k.a. Coast Ground Rose. Endemic in California. Peak bloom time: April-August.

Illustration of the differences in Rosa foliage (including R. spithamea) from Flora of North America (FNA): http://floranorthamerica.org/w/images/f/ff/FNA9_P12_Rosa_acicularis_subsp_sayi.jpeg

Plants of Monterey County: an Illustrated Field Key, 2nd edition, Matthews and Mitchell,2015, pp. 286-287.

Calflora (includes species distribution in CA): https://www.calflora.org/app/taxon?crn=7187

Jepson eFlora (with botanical illustration): https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=41696
Rosa spithamea: "Habit: Dwarf shrub, openly rhizomed, generally < 5 dm. Ecology: Open forest, chaparral, especially after fire. Stem: prickles few to many, generally not paired, 3--8(12) mm, generally slender (thick-based), +- straight. Leaf: axis generally glabrous (finely hairy), glandular; leaflets 5--7(9), 2--4 per side, (+-) glabrous; terminal leaflet +- 10--30 mm, +- widely elliptic (obovate), widest near middle, tip obtuse to truncate, margins +- double-toothed, glandular. Inflorescence: 1--10-flowered; pedicels generally 5--15 mm, glabrous, +- stalked-glandular. Flower: hypanthium generally 4--5 mm wide at flower, stalked-glandular, neck 3--4 mm wide; sepals generally glandular, entire, tip generally +- = body, entire; petals 10--15 mm, pink to red; pistils 10--20. Fruit: 7--12(15) mm wide, +- spheric; sepals +- erect, persistent; achenes 3.5--5 mm.
Synonyms: Rosa spithamea var. sonomensis "

Monterey County Wildflowers (photographic guide of wildflowers, shrubs and trees) https://montereywildflowers.com/index/ (species not listed)