Crataegus rivularis |
Crataegus floridana |
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mountain river hawthorn, river hawthorn |
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Habit | Shrubs or trees, 30–50 dm. | Shrubs, 60 dm, branches strongly weeping (moving in slight wind). |
Stems | twigs: new growth greenish, sparsely pubescent, early glabrescent, 1–2-years old often red-purple; bark on younger 2–5 cm thick branches dark gray-brown, sometimes copper-colored; thorns on twigs straight or ± recurved, 2-years old black or purple-black, glossy, fine, 1.5–4 cm. |
trunk bark dark brown, rimose; twigs: new growth pubescent, 1–2-years old dark purple-brown, slender; thorns on twigs ± straight, 1–2-years old dark purple-brown, fine, 2 cm. |
Leaves | petiole 1–2.5 cm, glabrous; blade elliptic to narrowly elliptic, 3–8 cm, length 2+ times width, thin, base cuneate, lobes 0 or small apiculi at ends of some vein tips, margins serrate, teeth numerous, usually acute, fine to coarse, venation semicamptodromous, veins 4 or 5 per side, larger often branched proximal to ends, apex acute, abaxial surface glabrous, adaxial appressed-strigose young. |
petiole slender, length 25–50% blade, pubescent, glandularity not recorded; blade spatulate to obtrullate, (1.5–)3–4 cm, thin (readily fluttering in wind), base cuneate, lobes 1 or 2 per side, ± obscure to ± distinct, lobe apex subacute, margins entire proximally, crenate to serrate distally, strongly gland-dotted young, veins 2 or 3 per side, apex subacute to acute, surfaces ± persistently pubescent. |
Inflorescences | 6–12-flowered; branches glandular-punctate; bracteoles early caducous, usually present, margins sessile-glandular. |
2–4-flowered; branches canescent-tomentose; bracteoles linear, margins glandular. |
Flowers | 14–17 mm diam.; sepals broadly deltate, 6–8 mm, margins entire, apex narrow, glabrous; stamens 10, anthers pink, sometimes ivory; styles 3–5. |
12–15 mm diam.; hypanthium tomentose; sepals narrowly triangular, margins ± entire, abaxially tomentose; petals 5; anthers cream; styles 3–5. |
Pomes | deep red (mid Aug), black or blackish purple mature, suborbicular, 10 mm diam.; sepals ± erect to strongly outcurved or ± patent, 2–3 mm; pyrenes 3 or 4, sides eroded. |
orange, ellipsoid to suborbicular, 6–8 mm diam., glabrate or hairy; sepals spreading; pyrenes 3–5. |
Crataegus rivularis |
Crataegus floridana |
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Phenology | Flowering mid May–early Jun; fruiting Aug–Sep. | Flowering Mar–Apr; fruiting Jul–Aug. |
Habitat | Intermontane streamsides, ditches, flood plains | Dry brush |
Elevation | 1300–2300 m (4300–7500 ft) | 0–200 m (0–700 ft) |
Distribution |
AZ; CO; ID; NM; NV; UT; WY
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FL; GA; NC; SC |
Discussion | Crataegus rivularis is most abundant in intermontane Colorado and Utah and is one of two hawthorns found in Arizona; it is rare in Nevada. There are reports from northwestern Texas (for example, D. S. Correll and M. C. Johnston 1970); they have not been verified. Crataegus rivularis is one of the more common woody species of mesic, valley bottom intermontane habitats. The species flowers early. Crataegus rivularis is superficially similar to the more or less sympatric, less common, C. saligna; it has larger leaves with fewer veins, larger flowers with ten stamens, and larger pomes. It differs from C. erythropoda little other than in leaf shape and ripe fruit color. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Crataegus floridana is frequent in north-central Florida and extends through much of Georgia with single records from Kershaw County, South Carolina, and Brunswick County, North Carolina. Crataegus floridana resembles C. quaesita in its more or less obtrullate, but distally lobed leaves (which can always be observed fluttering in the wind) and longer petioles. The largest leaves in subser. Tenues may be found in Crataegus floridana; there is considerable size variation. The depth and sharpness of the lobes is variable, with a maximum in the proportionately broadest leaves, these having been called C. anisophylla. Differences from 146. C. meridiana are noted there. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 510. | FNA vol. 9, p. 625. |
Parent taxa | Rosaceae > subfam. Amygdaloideae > tribe Maleae > Crataegus > sect. Douglasia > ser. Cerrones | Rosaceae > subfam. Amygdaloideae > tribe Maleae > Crataegus > sect. Coccineae > ser. Lacrimatae |
Sibling taxa | ||
Synonyms | C. anisophylla, C. quaesita var. floridana, C. versuta | |
Name authority | Nuttall: in J. Torrey and A. Gray, Fl. N. Amer. 1: 464. (1840) | Sargent: Bot. Gaz. 33: 124. (1902) |
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