Agave havardiana

Trelease

Rep. (Annual) Missouri Bot. Gard. 22: 91, plates 84–86. 1912.

Common names: Havard agave
Treatment appears in FNA Volume 26. Treatment on page 458. Mentioned on page 445, 450.

Plants acaulescent, sparsely suckering; rosettes usually solitary, (4–) 5–8 × (5–) 10–15 dm, rather open. Leaves ascending, 30–60 (–70) × 15–27 cm; blade glaucous-gray to gray-green, not cross-zoned, lanceolate to broadly lanceolate, rigid, adaxially concave, abaxially convex; margins straight, armed, teeth single, well defined, (5–) 7–10 mm, 1.5–2 cm apart; apical spine dark-brown to gray, subulate, 3–5 (–10) cm. Scape 2–7 m. Inflorescences paniculate, not bulbiferous, dense; bracts persistent, lanceolate, (3–) 5–10 cm; lateral branches 12–20, slightly ascending, comprising distal 1/2–2/3 of inflorescence, longer than 10 cm. Flowers 21–48 per cluster, erect, 6.8–9 cm; perianth yellow to yellow-green, tube funnelform, 14–22 × 15–22 mm, limb lobes erect, slightly unequal, 18–24 mm; stamens long-exserted; filaments inserted irregularly ca. mid perianth-tube, erect, yellow, 5–6.5 cm; anthers yellow, 25–30 mm; ovary 3–4 cm, neck constricted, 2–8 mm. Capsules short-pedicellate, oblong to obovoid, 4–5.7 cm, apex beaked. Seeds 6–7 mm.


Phenology: Flowering summer–early fall.
Habitat: Gravelly to rocky, often calcareous places in grasslands, desert scrub, pinyon-juniper, and oak woodlands
Elevation: 1200–2000 m

Discussion

Agave havardiana hybridizes with A. lechuguilla to form A. ×glomeruliflora, with which it may also hybridize.

Selected References

None.

Lower Taxa

None.

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

... more about "Agave havardiana"
longitudinal +
2.5 cm25 mm <br />0.025 m <br /> (3 cm30 mm <br />0.03 m <br />) +
width +  and length +
glandular-pubescent +  and glandular +
papillate +
5 cm50 mm <br />0.05 m <br /> (10 cm100 mm <br />0.1 m <br />) +
dark-brown +  and gray +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
James L. Reveal +  and Wendy C. Hodgson +
Trelease +
armed +  and filiferous +
not cross-zoned +, glaucous-gray +  and gray-green +
convex +, concave +, lanceolate +  and broadly lanceolate +
short to long +
thick +  and thin +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
persistent +
reflexed +, erect +  and ascending +
lanceolate +
umbel-like +
short-pedicellate +
oblong +  and obovoid +
4 cm40 mm <br />0.04 m <br /> (5.7 cm57 mm <br />0.057 m <br />) +
Havard agave +
fibrous-rooted +
Tex. +  and nw Mexico +
1200–2000 m +
pubescent +  and glabrous +
5 cm50 mm <br />0.05 m <br /> (6.5 cm65 mm <br />0.065 m <br />) +
recurved +  and erect +
loculicidal +
oblong +  and ovoid +
Gravelly to rocky, often calcareous places in grasslands, desert scrub, pinyon-juniper, and oak woodlands +
1/2 +  and 2/3 +
10 cm100 mm <br />0.1 m <br /> (?) +
pseudopetiolate +, sessile +  and simple +
60 cm600 mm <br />0.6 m <br /> (70 cm700 mm <br />0.7 m <br />) +
evergreen +
30cm;60cm +
15 cm150 mm <br />0.15 m <br /> (27 cm270 mm <br />0.27 m <br />) +
1.8 cm18 mm <br />0.018 m <br /> (2.4 cm24 mm <br />0.024 m <br />) +
dentate +, serrulate +  and entire +
Fleshy (?) +, Firm (?) +  and Rigid (?) +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (?) +  and 0.8 cm8 mm <br />0.008 m <br /> (?) +
cylindrical +, ovoid +  and 3-angled +
3 cm30 mm <br />0.03 m <br /> (?) +  and 4 cm40 mm <br />0.04 m <br /> (?) +
succulent +
not +  and articulate +
umbel-like +
semisucculent +
Flowering summer–early fall. +
Rep. (Annual) Missouri Bot. Gard. +
200 cm2,000 mm <br />2 m <br /> (700 cm7,000 mm <br />7 m <br />) +
globose +, obovoid +  and flattened +
semiwoody +
long-exserted +
branched +, , +  and unbranched +
aboveground +
3 +  and 1 +
papillate +
exserted +  and included +
subulate +
Agave havardiana +
species +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1.4 cm14 mm <br />0.014 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
15mm;22mm +
plant +  and suckering +
polycarpic +  and monocarpic +
small;gigantic +
petal-like +