Crataegus (sect. Coccineae) ser. Triflorae

Man. Cult. Trees ed. 2, 364. 1940.

Endemic
Basionym: Triflorae Beadle in J. K. Small, Fl. S.E. U.S., 533, 537. 1903
Synonyms: Crataegus sect. Triflorae (Beadle) C. K. Schneider
Treatment appears in FNA Volume 9. Treatment on page 609. Mentioned on page 492, 525, 605, 607, 608.

Shrubs, 20–50 dm, trunks fasciculate, multistemmed. Stems: trunk bark younger grayish, smooth, sometimes exfoliating in irregular papery patches, mature rough, gray-brown; branches spreading; twigs ± straight, new growth pubescent, 1-year old mid brown, older gray; thorns on twigs sparse to moderately frequent, ± straight, 2-years old dark gray or blackish, ± thin, 2–4 cm. Leaves: petiole length 33% blade, winged distally, densely pubescent, stipitate-glandular; blade mid to dark green, broadly ovate to broadly elliptic or nearly suborbiculate, 3–8 (–10) cm, ± chartaceous, base broadly cuneate to rounded or truncate, lobes 0 or 1–3 (or 4) per side, sinuses shallow, lobe apex subacute to acute, margins regularly, sharply glandular-serrate, proximally usually stipitate-glandular, venation craspedodromous, veins 5–7 per side, apex acute to subacute, abaxial surface mainly hairy on veins, adaxial hairy until maturity. Inflorescences 2–6 (–12) -flowered, reduced or larger convex panicles, usually borne on leafy short-shoots of season lateral to extension shoots, sometimes also on woody short-shoots; branches densely tomentose (intermixed with stipitate-glands); bracteoles caducous to semipersistent, ligulate, linear, large, membranous to herbaceous, margins stipitate-glandular. Flowers 25–30 mm diam.; hypanthium densely tomentose; sepals foliaceous, triangular, wide, 2/3–3/4 length of petals, herbaceous, margins glandular-pectinate, abaxially pubescent; petals broadly elliptic in C. austromontana; stamens 10 or 30–45 (–47), anthers cream; styles 3–5. Pomes 1–few per infructescence, red to ruddy, suborbicular to obovoid, 12–15 mm diam., hairy; flesh mealy to ± hard; sepals persistent, patent-reflexed, long, nonaccrescent; pyrenes 3–5.

Distribution

se United States

Discussion

Species 2 (2 in the flora).

Series Triflorae comprises one relatively common (Crataegus triflora) and one rare (C. austromontana) species, occurring from Louisiana to Georgia in the piedmont and north into Tennessee, with an outlier in Arkansas. The species are found in brush, including prairie margins and open woodlands; they are also able to tolerate considerable shade.

Species in ser. Triflorae are characterized by few- and large-flowered inflorescences, often borne on lateral leafy short shoots of the season, as well as by very glandular petioles, leaf margins, pedicels, and sepal margins, which are also usually very hairy. Also characteristic are the multiple stems lacking main trunk dominance. The most similar series is ser. Bracteatae. The 30–45 stamens of Crataegus triflora are unique in the genus.

Selected References

None.

Key

1 Leaf blades broadly ovate to suborbiculate, lobes 3(or 4) per side; stamens 10. Crataegus austromontana
1 Leaf blades broadly elliptic, entire or lobes 1–3(or 4) per side; stamens 30–45(–47). Crataegus triflora

"wide" is not a number.

0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
James B. Phipps +
Loudon +
thin-exfoliating +  and corrugated +
compound +  and simple +
opposite +  and alternate +
broadly cuneate +  and rounded or truncate +
Triflorae +
8 cm80 mm <br />0.08 m <br /> (10 cm100 mm <br />0.1 m <br />) +
broadly ovate +  and broadly elliptic or nearly suborbiculate +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 m <br />) +
caducous +  and semipersistent +
adnate +  and distinct +
crowded +, scattered +  and alternate +
se United States +
not +  and aggregated +
mealy +  and more or less hard +
2.5 cm25 mm <br />0.025 m <br /> (3 cm30 mm <br />0.03 m <br />) +
unisexual +  and bisexual +
not +  and aggregated +
not +  and aggregated +
yellow +  and red or purplish +
0.6 cm6 mm <br />0.006 m <br /> (2 cm20 mm <br />0.02 m <br />) +
gray +  and brown +
older +, old +  and new +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
2-6(-12)-flowered +
crassinucellate +
deciduous +
craspedodromous +
pubescent +  and stipitate-glandular +
glandular-pectinate +
inferior +  and superior +
biseriate +  and clustered +
collateral +  and basal +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0 (?) +  and 4 (?) +
free +  and distinct +
post-mature +
stipitate-glandular +  and pubescent +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
pruinose +
red +  and ruddy +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
suborbicular +  and obovoid +
Man. Cult. Trees ed. +
not arillate +
persistent +
free +  and distinct +
patent-reflexed +
triangular +
nonaccrescent +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
glabrous +  and tomentose +
Crataegus sect. Triflorae +
Crataegus (sect. Coccineae) ser. Triflorae +
Crataegus sect. Coccineae +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
blackish +, dark gray +  and old +
straight +
slender +  and stout +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
craspedodromous +  and gland-tipped +
inconspicuous +
mature +  and younger +
exfoliating +
less erect +  and oblique +
1 +  and several +
straight +
determinate +
5 +  and 7 +