Flora of North America species comparison

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Crataegus reverchonii

Reverchon hawthorn, Reverchon's hawthorn
Habit Shrubs, 10–30(–80) dm.
Stems

twigs: new growth glabrous, 1-year old dark gray;

thorns on twigs slightly reflexed, 2-years old blackish, usually stout, 3–6 cm.
Leaves

petiole 2–5 mm, length 7–11% blade, glabrous, eglandular;

blade (on extension shoots) ± orbiculate to broadly elliptic, (on short shoots) ± orbiculate to broadly oblong-elliptic, 2–6 cm, very coriaceous, base broadly cuneate, lobes 0, margins serrulate in distal 1/2, venation semicamptodromous, veins 5 or 6 per side, apex subacute to obtuse, surfaces sparsely hairy young, glabrescent.
Inflorescences

8–15-flowered;

branches usually glabrous;

bracteoles linear, small, margins short-stipitate-glandular.
Flowers

8–12 mm diam.;

hypanthium glabrous, sometimes slightly pilose;

sepals 4 mm, margins subentire, abaxially glabrous;

stamens 10–15(–20), anthers cream, rose, or red;

styles (2 or)3–5.
Pomes

red to orange-red, suborbicular, 10 mm diam., glabrous;

sepals persistent, patent or reflexed;

pyrenes (1–)3–5.

Crataegus reverchonii
Distribution
from FNA
AL; AR; DE; GA; KS; LA; MO; MS; OK; TN; TX
[WildflowerSearch map]
Discussion

Varieties 3 (3 in the flora).

Crataegus reverchonii is differentiated from C. crus-galli by a greater number of styles and pyrenes (except for var. mohrii) and extension-shoot leaves that tend to be suborbiculate. Distinction from a small-leaved form of C. crus-galli from the Edwards Plateau, Texas, needs elucidation. Crataegus stevensiana is sometimes separated out as a variety or species; however, the complex, unresolved variation makes this distinction moot at the moment.

The principal variation within Crataegus reverchonii is between smaller-statured, smaller-leaved, smaller-fruited, more-styled, xeromorphic plants of the southwest (var. reverchonii), and larger-leaved, large-flowered, fewer-styled plants of the mid latitude, eastern United States (var. palmeri). Variety mohrii is intermediate.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Short-shoot leaf blades 4–6 cm; flowers 10–12 mm diam.; styles (2 or)3.
var. palmeri
1. Short-shoot leaf blades 2–3.5 cm; flowers 8–12 mm diam.; styles 3–5
→ 2
2. Flowers 8–10 mm diam.; inflorescences usually glabrous; w of Mississippi River.
var. reverchonii
2. Flowers 12 mm diam.; inflorescences often pilose; e of Mississippi River.
var. mohrii
Source FNA vol. 9, p. 537.
Parent taxa Rosaceae > subfam. Amygdaloideae > tribe Maleae > Crataegus > sect. Coccineae > ser. Crus-galli
Sibling taxa
C. aemula, C. aestivalis, C. alabamensis, C. alleghaniensis, C. annosa, C. aprica, C. aquacervensis, C. ashei, C. atrovirens, C. attrita, C. austromontana, C. beata, C. berberifolia, C. biltmoreana, C. brachyacantha, C. brainerdii, C. brazoria, C. brittonii, C. buckleyi, C. calpodendron, C. castlegarensis, C. chrysocarpa, C. coccinea, C. coccinioides, C. cognata, C. collina, C. colonica, C. communis, C. compacta, C. condigna, C. craytonii, C. crocea, C. crus-galli, C. cupressocollina, C. delawarensis, C. dispar, C. dodgei, C. douglasii, C. egens, C. egregia, C. enderbyensis, C. erythropoda, C. exilis, C. eximia, C. extraria, C. fecunda, C. flabellata, C. flava, C. florens, C. floridana, C. florifera, C. fluviatilis, C. formosa, C. frugiferens, C. furtiva, C. gattingeri, C. gaylussacia, C. gilva, C. greggiana, C. harbisonii, C. holmesiana, C. ignava, C. incilis, C. integra, C. intricata, C. invicta, C. iracunda, C. irrasa, C. jesupii, C. jonesiae, C. lacrimata, C. laevigata, C. lanata, C. lancei, C. lanuginosa, C. lassa, C. laurentiana, C. leonensis, C. lepida, C. levis, C. lumaria, C. macracantha, C. macrosperma, C. magniflora, C. margarettae, C. marshallii, C. mendosa, C. meridiana, C. mira, C. mollis, C. monogyna, C. munda, C. nananixonii, C. neobushii, C. nitida, C. oakesiana, C. okanaganensis, C. okennonii, C. opaca, C. opima, C. orbicularis, C. ouachitensis, C. padifolia, C. pennsylvanica, C. persimilis, C. pexa, C. phaenopyrum, C. phippsii, C. pinetorum, C. populnea, C. prona, C. pruinosa, C. pulcherrima, C. punctata, C. purpurella, C. quaesita, C. rivularis, C. rivuloadamensis, C. rivulopugnensis, C. roribacca, C. rubella, C. rubribracteolata, C. saligna, C. sargentii, C. scabrida, C. schizophylla, C. schuettei, C. segnis, C. senta, C. sheila-phippsiae, C. sheridana, C. shuswapensis, C. sororia, C. spathulata, C. spes-aestatum, C. stolonifera, C. stonei, C. submollis, C. suborbiculata, C. succulenta, C. tecta, C. teres, C. texana, C. tracyi, C. triflora, C. turnerorum, C. uniflora, C. ursopedensis, C. venusta, C. viridis, C. visenda, C. wattiana, C. williamsii, C. wootoniana, C. ×atrorubens, C. ×bicknellii, C. ×coleae, C. ×collicola, C. ×disperma, C. ×dispessa, C. ×fretalis, C. ×incaedua, C. ×kelloggii, C. ×latebrosa, C. ×lucorum, C. ×rufula, C. ×sicca, C. ×vailiae
Subordinate taxa
C. reverchonii var. mohrii, C. reverchonii var. palmeri, C. reverchonii var. reverchonii
Name authority Sargent: Trees & Shrubs 1: 55, plate 28. (1903)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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