Allionia choisyi

Standley

Publ. Field Mus. Nat. Hist., Bot. Ser. 8: 310. 1931.

Common names: Trailing four-o’clock umbrella-wort garapatilla
Illustrated
Basionym: Allionia incarnata var. glabra Choisy in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 13(2): 435. 1849,
Treatment appears in FNA Volume 4. Treatment on page 60. Mentioned on page 58, 59.

Herbs, annual [probably also perennial], glabrate to viscid-pubescent. Stems often reddish, 0.1–0.7 [–2] m. Leaves progressively reduced distally; distal leaves proportionately narrower than proximal; larger leaves: petiole 2–18 [–30] mm, equaling or shorter than blade; blade usually undulate, sometimes flat, 10–30 × 6–22 mm, base often oblique, obtuse, or round, margins sinuate, sometimes entire, apex narrowing to rounded tip, obtuse, or acute. Inflorescences: peduncle 1–9 (–12) mm; involucres broadly ovoid to spheric when mature, 4–7.5 mm. Perianth pale-pink to magenta [nearly white], 2–7 mm. Fruits shallowly convex, 3.2–4.3 × 1.8–3.7 mm; lateral ribs with 4–8 teeth, teeth slender and attenuate, sometimes gland-tipped [rarely mostly entire with short-toothed margin], concave side of fruit with 5–7 glands per row; stalk equaling or longer than diameter of glandular head.


Phenology: Flowering late spring–early fall [year-round].
Habitat: Open arid areas, often on sandy or gravelly soils, sometimes on clay or gypsum
Elevation: [0-]800-1600[-2500] m

Distribution

V4 117-distribution-map.gif

Ariz., N.Mex., Tex., Utah, Mexico, West Indies, Central America, South America

Discussion

The low, broad fruit of Allionia choisyi resembles a small, clinging tick, hence the Spanish name “garapatilla.” Occasionally the fruits are strongly convex, others may have four moderately slender teeth; in either case the fruits are intergradient to the few-toothed, strongly convex fruits of A. incarnata. Such plants are most commonly found in southeastern Arizona and in arid south-central Texas. Plants with fruits shaped as those in A. choisyi, with glands on the concave surface with tall stalks but with entire or nearly entire, curved, lateral ribs occur occasionally in South America. Collectors have noted that A. choisyi plants hug the ground more closely than those of A. incarnata. Throughout much of its range in North America, A. choisyi has leaves with strongly pleated-undulate blades. Very small, pale pink to white flowers are also more common in A. choisyi, especially in Mexico.

In the flora area Allionia choisyi is usually an annual. In Mexico, plants often appear to be perennial.

Selected References

None.

Lower Taxa

None.

"thin" is not a number."proportionately narrower" is not a number.

... more about "Allionia choisyi"
narrowing +
Richard W. Spellenberg +
Standley +
glutinous +
round +, obtuse +  and oblique +
unequal +
woody +, leathery +  and fleshy +
Allionia incarnata var. glabra +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
undulate +
6mm;22mm +
persistent +
distinct +
cucullate +  and ovate +
not accrescent +
corollalike +  and petaloid +
keeled +  and toothed +
Trailing four-o’clock +, umbrella-wort +  and garapatilla +
Ariz. +, N.Mex. +, Tex. +, Utah +, Mexico +, West Indies +, Central America +  and South America +
[0-]800-1600[-2500] m +
curved +  and straight +
inconspicuous +  and showy +
single +  and 3 +
chasmogamous +  and bisexual +
3.2mm;4.3mm +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.37 cm3.7 mm <br />0.0037 m <br />) +
Open arid areas, often on sandy or gravelly soils, sometimes on clay or gypsum +
broadly ovoid +  and spheric +
0.4 cm4 mm <br />0.004 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
reduced +
fan--shaped +
pubescent +  and glabrous +
expanded +
0.9 cm9 mm <br />0.009 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
1.8 cm18 mm <br />0.018 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
Flowering late spring–early fall [year-round]. +
Publ. Field Mus. Nat. Hist., Bot. Ser. +
fibrous;fleshy +
membranaceous +
ribbed +, 10-ribbed +  and 5-ribbed +
pubescent +, glabrous +  and warty +
wrinkled +
concave +
Illustrated +
10 cm100 mm <br />0.1 m <br /> (70 cm700 mm <br />0.7 m <br />) +
fusiform +  and linear +
filiform +
Wedelia +  and Wedeliella +
Allionia choisyi +
Allionia +
species +
rounded +
gland-tipped +
attenuate +
slender +
glabrate +  and viscid-pubescent +