Agave ×ajoensis

W. C. Hodgson

Novon 11: 414, fig. 2. 2001.

Common names: Ajo agave
Treatment appears in FNA Volume 26.

Plants acaulescent, freely suckering; rosettes solitary or more commonly cespitose, 1.9–4 × 2.5–4.5 dm. Leaves spreading, widest near middle, 16–34 × 1.5–3 cm; blade light green, without “budprints” but sometimes with a lighter green midstripe, linearlanceolate, rigid, adaxially shallowly concave toward apex, abaxially thickly convex toward base; margins entire, straight, nonfiliferous, unarmed except for small interstitial teeth near leaf base; apex acute to long-acuminate, spine reddish-brown, aging gray, subulate, 1.5–2.5 cm. Scape 2.5–3.5 m. Inflorescences subspicate to narrowly racemose-paniculate on distal 1/3; bracts caducous, narrowly triangular, 2–3 cm; lateral branches 30–40, ascending, 4 cm or shorter. Flowers (3–) 4–6 per cluster, erect, straight, (3.2–) 3.5–5.3 cm; perianth yellow, tube funnelform, (4–) 6–21 × 8–13 mm, limb lobes erect to ascending, slightly unequal, 10–20 mm; stamens slightly exserted; filaments inserted equally or subequally 6–16 mm above base of perianth-tube, erect, light yellow, (1.7–) 2–3 cm; anthers yellow, 9–14 mm; ovary 1–1.7 cm, neck constricted, 2–6 mm. Capsules short-pedicellate, ellipsoid, 1.2–2.1 cm, apex short-beaked. Seeds unknown. 2n = 90.


Phenology: Flowering late spring–summer.
Habitat: Rocky slopes in desert scrub and grasslands
Elevation: 900–1100 m

Discussion

Agave ×ajoensis appears to be of hybrid origin involving A. deserti var. simplex and A. schottii var. schottii. It is a triploid, having a chromosome number of 2n = 90; in the same area, var. simplex is a diploid (2n = 60) and var. schottii is a tetraploid (2n = 120).

Selected References

None.

Lower Taxa

None.

"broadened" is not a number."widest" is not a number."dm" is not declared as a valid unit of measurement for this property.

... more about "Agave ×ajoensis"
longitudinal +
0.9 cm9 mm <br />0.009 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
width +  and length +
glandular-pubescent +  and glandular +
papillate +
sharp-pointed +
James L. Reveal +  and Wendy C. Hodgson +
W. C. Hodgson +
armed +  and filiferous +
light green +
convex +  and concave +
short to long +
thick +  and thin +
reflexed +, erect +  and ascending +
triangular +
umbel-like +
short-pedicellate +
ellipsoid +
1.2 cm12 mm <br />0.012 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
Ajo agave +
fibrous-rooted +
900–1100 m +
1.7 cm17 mm <br />0.017 m <br /> (2 cm20 mm <br />0.02 m <br />) +
pubescent +  and glabrous +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
recurved +  and erect +
loculicidal +
oblong +  and ovoid +
Rocky slopes in desert scrub and grasslands +
bulbiferous +, bracteate +, open +  and spicate +
subspicate +  and narrowly racemose-paniculate +
4 cm40 mm <br />0.04 m <br /> (?) +
pseudopetiolate +, sessile +  and simple +
evergreen +
16cm;34cm +
erect +  and ascending +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
unarmed +  and nonfiliferous +
Fleshy (?) +, Firm (?) +  and Rigid (?) +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
lighter green +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (?) +  and 0.6 cm6 mm <br />0.006 m <br /> (?) +
cylindrical +, ovoid +  and 3-angled +
1 cm10 mm <br />0.01 m <br /> (?) +  and 1.7 cm17 mm <br />0.017 m <br /> (?) +
succulent +
not +  and articulate +
umbel-like +
semisucculent +
Flowering late spring–summer. +
250 cm2,500 mm <br />2.5 m <br /> (350 cm3,500 mm <br />3.5 m <br />) +
globose +, obovoid +  and flattened +
gray +  and reddish-brown +
subulate +
1.5 cm15 mm <br />0.015 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
semiwoody +
branched +, , +  and unbranched +
aboveground +
3 +  and 1 +
papillate +
exserted +  and included +
subulate +
Agave ×ajoensis +
species +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
8mm;13mm +
plant +  and suckering +
polycarpic +  and monocarpic +
small;gigantic +
petal-like +