Species

• Common name: Alternate-leaf dogwood / pagoda dogwood
• Scientific name: Cornus alternifolia L.f.
• Family: Cornaceae (dogwood family)
• Confidence: High (zoomed-photo + range verification; see "Verification round 2")

Evidence (tied to photos)

• Dogwood venation — IMG_4980, IMG_4990, IMG_4991: 5–6 pairs of secondary veins that arc forward and run nearly parallel to the entire (untoothed) margin toward the tip, and are deeply impressed into the blade (quilted/rugose look). This camptodromous "dogwood arc" is diagnostic for Cornus.
• Fruit = the clincher — IMG_4981: a branched cyme with orange-red / coral pedicels carrying round drupes ripening green → pink/purple → bluish-black, several already blue-black. Bluish-black drupes on orange-red stalks is the textbook signature of C. alternifolia and separates it from the pale-blue, greenish-to-reddish-stalked fruit of silky dogwood.
• Habit / phyllotaxy — IMG_4980, IMG_4983: leaves crowded and whorled-looking at the ends of the twigs, the classic "false whorl" of alternate-leaf dogwood (leaves are truly alternate but clustered at branch tips).
• Leaf underside — IMG_4990, IMG_4991: paler, slightly glaucous (waxy) underside with brownish tissue near the petiole; consistent with C. alternifolia.
• Twig — IMG_4983, IMG_4992: slender woody twig, gray-brown with lenticels and raised leaf scars; green current-season growth at the tip.

Verification round 2 (zoomed crops + range check)

I re-examined full-resolution crops of the originals to settle the one open question — leaf/branch arrangement — because C. alternifolia is the only alternate-leaved dogwood in the eastern U.S.; every other Cornus here is opposite. So this single character is decisive.

• Alternate / sympodial branching — the clincher (zoom of IMG_4992): the woody twig branches in a zig-zag, one-side-at-a-time pattern, with a lateral diverging from a node without a matching branch opposite it. Opposite-leaved dogwoods (amomum, florida, foemina) branch in symmetric pairs. Alternate branching → C. alternifolia.
• Terminal "false whorl" (zoom of IMG_4983): leaves radiate from a crowded terminal cluster with very short internodes, rather than as separated opposite pairs — the "nearly whorled" look the NC State herbarium uses for this species.
• Coral-red pedicels + uniform blue-black drupes (zoom of IMG_4981): the cyme is green at the base grading into coral/red branchlets, carrying drupes that are evenly blue-black with no white/blotchy marbling. Silky dogwood drupes are typically paler blue and often white-marbled — so this detail also points away from amomum.
• Underside pale/glaucous, not rusty (zoom of IMG_4990/4991): leaf undersides are pale and slightly waxy with no dense rusty-brown silky pubescence; silky dogwood has conspicuous rusty appressed hairs beneath. Another strike against amomum.
• Leaf-shape range confirmed: flora descriptions give C. alternifolia leaves as "narrowly to broadly ovate or obovate, cuneate to rounded base, 4–12 cm," so the broad, rounded, rugose leaves in IMG_4990/4991 and the more elongate ones in IMG_4980 are both normal for this species — the earlier shape inconsistency is resolved.
• Range confirmed: NC State herbarium lists C. alternifolia as "Common" in the NC Mountains in moist forests; Polk County / the Blue Ridge escarpment is squarely within range.

Net: the alternate branching alone is diagnostic, and every other character (fruit, pedicel color, ripening date, venation, underside, habitat, range) agrees. Confidence High. (Only-if-curious field check: on the parent plant, a lower twig will show single/spiraled leaf attachment, confirming alternate.)

Look-alikes ruled out

Master key: the collected material shows alternate branching, and C. alternifolia is the only alternate-leaved dogwood in the eastern U.S. — that alone eliminates every opposite-leaved Cornus below. Each is also cross-checked on a second character.

• Silky dogwood (Cornus amomum) — the main alternative. Opposite leaves; fruit ripens white → pale blue on greenish-to-reddish stalks, later (Aug–Sep); a wetland/streambank thicket shrub. Ruled out by the orange-red pedicels + bluish-black fruit already ripe in mid-July and the tip-clustered (not paired-at-every-node) foliage.
• Flowering dogwood (Cornus florida) — red (not blue) fruit; opposite; ruled out by fruit color and the branched cyme (florida has clustered drupes, no showy red cyme).
• Gray dogwood (Cornus racemosa) / redosier (C. sericea) — white fruit; ruled out by blue-black drupes.
• Stiff / swamp dogwood (Cornus foemina) — has blue drupes on reddish cymes too, but is opposite-leaved, narrower-leaved, and mainly a Coastal Plain/Piedmont wet species (uncommon in mountain coves). Ruled out by alternate branching + broad rugose leaves + mountain-cove site.
• Viburnum nudum / witherod (V. cassinoides) — also has multi-colored cymes of blue-black drupes in wet ground, and was seriously considered. Ruled out by venation: viburnum has straighter pinnate veins running into the margin, whereas these leaves show the veins bending to parallel the margin (dogwood arc), plus the deeply impressed dogwood venation.

Habitat check

Excellent fit. C. alternifolia in NC is "primarily in the Mountains, rare in the Piedmont," growing in cool, moist, rich acidic woods, coves, and stream banks — exactly the Saluda / Blue Ridge escarpment, <50 m from a stream, low cove-like valley collection setting. It likes cool root zones and humus-rich soils, which the collection site provides.

Seed propagation

• Maturity window: For this species fruit ripens bluish-black by mid-summer, so the mid-July collection is well-timed — unusually, this is not an immature-seed problem. The already blue-black drupes in IMG_4981 hold viable seed; the green and pink ones are still developing and are best left/discarded.
• Clean: Sort out the fully blue-black fruits. Soften the pulp in water a day or two, then mash and rinse; float off pulp and empty/floating stones. Each drupe has one hard stony pit. A short soak in a very dilute bleach solution helps remove pulp and reduce mold. Do not let cleaned seed dry out if you can sow promptly.
• Dormancy: Physiological embryo dormancy in a hard endocarp. Two reliable routes:
  1. Warm + cold: 60 days warm, moist (68–86 °F) then 60–90 days cold, moist (~34–41 °F). Sowing fresh, right now and leaving flats outdoors over winter lets nature run the warm-then-cold sequence.
  2. Cold only: ~90–120 days cold, moist stratification at ~41 °F is usually enough; sow in spring at 70–85 °F.
• Germination timeline: After stratification, emergence in roughly ~3 months (about 13–14 weeks) at warm germinating temperatures. Expect the classic dogwood pattern: some seed may sit until a second spring — don't discard flats after one season.

Vegetative propagation

• Softwood / semi-hardwood tip cuttings (best odds): Take in summer (now is in range) from the current season's growth. Dip in IBA rooting hormone (~6,000 ppm K-IBA liquid, or up to ~16,000 ppm IBA talc), stick under mist/fog, roots in ~6–8 weeks; realistically up to ~60% success. Overwinter the rooted cuttings with minimal disturbance — first-year rooted dogwoods are fragile.
• Hardwood cuttings: Pagoda dogwood is one of the easier dogwoods — dormant hardwood cuttings will sometimes root in a bucket of damp sand over winter.
• Layering: Low horizontal branches (this species' pagoda tiers sit low) can be soil-layered and left a season to root — low-effort backup.

Grow-out in the NC Piedmont

• Hardiness reality check: C. alternifolia is rated ~USDA 3–7b and struggles in zone 8 / hot humid summers. Much of the NC Piedmont is 7b–8a, warmer and with heavier clay than the Saluda escarpment collection site — so this is the least Piedmont-friendly plant in the collection so far. Plan for the microclimate, not the average.
• Site: Give it a cool, shaded-to-part-shade spot — morning sun / afternoon shade, ideally a north/east-facing or wooded edge. Avoid hot, open, reflected-heat locations.
• Soil: Acidic, rich, well-drained but consistently moist, high organic matter. Amend heavy clay with compost and mulch heavily to keep the root zone cool and damp. Water through Piedmont summer droughts.
• Cautions: Shallow-rooted and transplant-sensitive — move seedlings young and handle roots gently. Prone to golden canker (Cryptodiaporthe) stress in hot, dry, sunny sites, which is another reason to keep it cool and moist.

Actionable next step for Colin

1. From IMG_4981, pick out the blue-black drupes only, clean off the pulp, and sow the stones fresh right now in a deep pot of gritty, humusy mix. Leave it outdoors, shaded, and never dry through fall and winter to get the natural warm-then-cold cycle; watch for germination next spring, and again the spring after.
2. Hedge with cuttings: if you can still get back to the parent plant (or from any attached green tips you collected), take softwood tip cuttings, hormone + mist, this summer.
3. Confirm the ID in one glance next visit: check a lower twig for alternate (single, spiraled) leaf attachment vs. opposite pairs — alternate confirms C. alternifolia.
4. Reserve a cool, shaded, moisture-retentive corner of the Piedmont garden for it; this is a mountain species being pushed toward the warm edge of its range.

Sources

• NC State Extension — Cornus alternifolia (Alternate-leaf Dogwood)
• NC State Extension — Cornus amomum (Silky Dogwood)
• Will Cook, Carolina Nature — Alternate-leaved Dogwood (Cornus alternifolia)
• Illinois Wildflowers — Alternate-leaved Dogwood
• Lady Bird Johnson Wildflower Center — Cornus alternifolia
• Virginia Tech Dendrology — Cornus alternifolia fact sheet
• NC State Herbarium (TNC) — Cornus key & NC distribution
• Trees and Shrubs Online — Cornus alternifolia (leaf dimensions/description)
• UF/IFAS Landscape Plant Propagation — Cornus alternifolia