Agave americana subsp. americana

Treatment appears in FNA Volume 26.

Plants acaulescent or short-stemmed, trunks less than 2 m; rosettes open or dense. Leaves erect, ascending, or frequently reflexed, 100–200 × 15–25 cm; blade light green to green or glaucous-gray, sometimes variegated yellow or whitish, especially in cultivated forms, sometimes cross-zoned, lanceolate, adaxially plane and somewhat guttered near base, abaxially convex near base; margins straight or undulate to crenate, teeth 5–10 mm; apical spine conical or subulate, 2–5 cm. Scape 5–9 m. Inflorescences: lateral branches 15–35. Flowers 7–10 cm; perianth-tube 8–20 × 12–20 cm; ovary 3–4.5 cm. Capsules 4–8 cm. Seeds unknown.

Discussion

Varieties 3 (2 in the flora).

Selected References

None.

Key

1 Apical leaf spine 3–5 cm, leaves frequently reflexed; Texas. Agave americana var. americana
1 Apical leaf spine 2–3 cm, leaves erect; Arizona. Agave americana var. expansa

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

longitudinal +
2.5 cm25 mm <br />0.025 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
width +  and length +
glandular-pubescent +  and glandular +
papillate +
dark-brown +  and grayish +
subulate +  and conical +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
James L. Reveal +  and Wendy C. Hodgson +
Linnaeus +
armed +  and filiferous +
cross-zoned +, whitish +, variegated yellow +, light green +  and green or glaucous-gray +
convex +, plane +  and lanceolate +
short to long +
thick +  and thin +
persistent +
reflexed +, erect +  and ascending +
triangular +
umbel-like +
short-pedicellate +
4 cm40 mm <br />0.04 m <br /> (8 cm80 mm <br />0.08 m <br />) +
fibrous-rooted +
sw United States +  and Mexico +
pubescent +  and glabrous +
6 cm60 mm <br />0.06 m <br /> (9 cm90 mm <br />0.09 m <br />) +
7 cm70 mm <br />0.07 m <br /> (10 cm100 mm <br />0.1 m <br />) +
cultivated +
loculicidal +
oblong +  and ovoid +
1/3 +  and 1/2 +
horizontal +  and slightly ascending +
10 cm100 mm <br />0.1 m <br /> (?) +
pseudopetiolate +, sessile +  and simple +
evergreen +
100cm;200cm +
15 cm150 mm <br />0.15 m <br /> (25 cm250 mm <br />0.25 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (2 cm20 mm <br />0.02 m <br />) +
dentate +, serrulate +  and entire +
undulate to crenate +  and straight +
Fleshy (?) +, Firm (?) +  and Rigid (?) +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
constricted +
0.3 cm3 mm <br />0.003 m <br /> (?) +  and 0.6 cm6 mm <br />0.006 m <br /> (?) +
cylindrical +, ovoid +  and 3-angled +
3 cm30 mm <br />0.03 m <br /> (?) +  and 4.5 cm45 mm <br />0.045 m <br /> (?) +
succulent +
not +  and articulate +
umbel-like +
12 cm120 mm <br />0.12 m <br /> (20 cm200 mm <br />0.2 m <br />) +
semisucculent +
not cespitose +
500 cm5,000 mm <br />5 m <br /> (900 cm9,000 mm <br />9 m <br />) +
globose +, obovoid +  and flattened +
semiwoody +
long-exserted +
branched +, , +  and unbranched +
aboveground +
3 +  and 1 +
papillate +
exserted +  and included +
subulate +
Agave americana subsp. americana +
Agave americana +
subspecies +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0 cm0 mm <br />0 m <br /> (200 cm2,000 mm <br />2 m <br />) +
subequal +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
short-stemmed +  and acaulescent +
polycarpic +  and monocarpic +
small;gigantic +
petal-like +