Crataegus rivularis |
Crataegus pinetorum |
|
---|---|---|
mountain river hawthorn, river hawthorn |
pineland hawthorn |
|
Habit | Shrubs or trees, 30–50 dm. | Shrubs or trees, 20–60 dm. |
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. |
twigs: new growth strongly reddish, 1-year old shiny reddish brown, 2d year dull gray-brown, older dull gray; thorns on twigs usually present, ± straight, 1-year old shiny black or reddish black, 2-years old becoming black, fine, 2–3.5 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 length 25–30% blade, sparsely to densely glandular or stipitate-glandular; blade narrowly ovate to narrowly elliptic, 4–6 cm (nearly mature at anthesis), base cuneate, lobes 2 or 3 per side, sinuses shallow, max LII 10–30%, lobe apex acute, margins with extremely small teeth, veins 5 or 6 per side, apex acute, vein pubescence not recorded. |
Inflorescences | 6–12-flowered; branches glandular-punctate; bracteoles early caducous, usually present, margins sessile-glandular. |
2–4-flowered; branches glabrous; bracteoles ± persistent, numerous, narrowly obovate, chartaceous to subherbaceous, margins densely 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. |
at anthesis not recorded; sepals narrowly triangular, 6 mm, margins finely glandular-serrate, abaxially glabrous; anther color not recorded; style number not recorded. |
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. |
dull red, suborbicular, 12–14 mm diam.; sepals erose; pyrenes 2–4. |
2n | = 51. |
|
Crataegus rivularis |
Crataegus pinetorum |
|
Phenology | Flowering mid May–early Jun; fruiting Aug–Sep. | Flowering Apr; fruiting Sep–Oct. |
Habitat | Intermontane streamsides, ditches, flood plains | Woodland edges and gaps |
Elevation | 1300–2300 m (4300–7500 ft) | 100–200 m (300–700 ft) |
Distribution |
AZ; CO; ID; NM; NV; UT; WY
|
AL; GA; MS |
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 pinetorum is found from south-central Mississippi through Alabama to northern Georgia; it appears to be scarce. The species is most similar to C. pulcherrima, differing in its sharply, rather than obtusely, lobed leaves, often densely glandular petioles, exceptionally small leaf marginal teeth and red pomes. The species also somewhat resembles the more deeply incised forms of C. gilva. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 510. | FNA vol. 9, p. 583. |
Parent taxa | Rosaceae > subfam. Amygdaloideae > tribe Maleae > Crataegus > sect. Douglasia > ser. Cerrones | Rosaceae > subfam. Amygdaloideae > tribe Maleae > Crataegus > sect. Coccineae > ser. Pulcherrimae |
Sibling taxa | ||
Name authority | Nuttall: in J. Torrey and A. Gray, Fl. N. Amer. 1: 464. (1840) | Beadle: Bot. Gaz. 30: 343. (1900) |
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