Agave shawii var. shawii

Common names: Shaw agave
Illustrated
Synonyms: Agave orcuttiana Trelease Agave pachyacantha Trelease
Treatment appears in FNA Volume 26. Treatment on page 455.

Plants short-stemmed, budding from leaf-axils, forming fragmented supine clones or sometimes single rosettes, trunks erect to decumbent, shorter than 2 m; rosettes solitary or cespitose, 0.8–20 × 10–25 dm. Leaves ascending, 20–50 × 8–20 cm; blade glossy light to dark green, not cross-zoned, narrowly ovate, rigid, adaxially plane to slightly hollowed at least toward apex, abaxially convex; margins straight, armed, teeth single, well defined, mostly 5–6 mm, 1–2+ cm apart; apical spine dark reddish-brown to gray, acicular, 2–4 cm. Scape 2–4 m. Inflorescences paniculate, not bulbiferous; bracts persistent, lanceolate to triangular, 10–25 cm; lateral branches 8–14, horizontal to ascending, comprising distal 1/4–1/2 of inflorescence, longer than 10 cm. Flowers 35–75 per cluster, erect, 6–10 cm; perianth yellow to reddish, especially upon withering, tube broadly funnelform, 12–19 × 15–22 mm, limb lobes erect, unequal, 17–40 mm; stamens long-exserted; filaments inserted near mid perianth-tube, erect, yellow, 4.3–7 cm; anthers yellow, 20–35 mm; ovary 3–5 cm, neck slightly constricted, 6–15 mm. Capsules short-pedicellate, obovoid to oblong, 5.5–7 cm, apex short to long-beaked. Seeds 4–7 mm. 2n = 60.


Phenology: Flowering winter–mid spring.
Habitat: Coastal bluffs with coastal sage scrub and chaparral
Elevation: 0–100 m

Distribution

V26 948-distribution-map.jpg

Calif., Mexico (Baja California)

Discussion

Agave shawii was abundant in southern California at the beginning of the twentieth century. Since then, unrestricted collecting and habitat destruction reduced the populations significantly. By 1969 the species was believed to occur in California only within the U.S. Navy area at Point Loma (Moran 16707, DES, SD). At present, native populations are known only from Border Fields State Park north of Tijuana, although plants have been introduced at other locales.

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 shawii var. shawii"
longitudinal +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
width +  and length +
glandular-pubescent +  and glandular +
papillate +
dark reddish-brown +  and gray +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
James L. Reveal +  and Wendy C. Hodgson +
Engelmann +
armed +  and filiferous +
not cross-zoned +, light +  and dark green +
convex +, plane +  and ovate +
short to long +
thick +  and thin +
persistent +
reflexed +, erect +  and ascending +
lanceolate +  and triangular +
umbel-like +
short-pedicellate +
obovoid +  and oblong +
5.5 cm55 mm <br />0.055 m <br /> (7 cm70 mm <br />0.07 m <br />) +
Shaw agave +
fibrous-rooted +
Calif. +  and Mexico (Baja California) +
0–100 m +
pubescent +  and glabrous +
4.3 cm43 mm <br />0.043 m <br /> (7 cm70 mm <br />0.07 m <br />) +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
loculicidal +
oblong +  and ovoid +
Coastal bluffs with coastal sage scrub and chaparral +
1/4 +  and 1/2 +
horizontal +  and ascending +
10 cm100 mm <br />0.1 m <br /> (?) +
pseudopetiolate +, sessile +  and simple +
evergreen +
20cm;50cm +
8 cm80 mm <br />0.08 m <br /> (20 cm200 mm <br />0.2 m <br />) +
1.7 cm17 mm <br />0.017 m <br /> (4 cm40 mm <br />0.04 m <br />) +
dentate +, serrulate +  and entire +
Fleshy (?) +, Firm (?) +  and Rigid (?) +
constricted +
0.6 cm6 mm <br />0.006 m <br /> (?) +  and 1.5 cm15 mm <br />0.015 m <br /> (?) +
cylindrical +, ovoid +  and 3-angled +
3 cm30 mm <br />0.03 m <br /> (?) +  and 5 cm50 mm <br />0.05 m <br /> (?) +
succulent +
not +  and articulate +
umbel-like +
semisucculent +
Flowering winter–mid spring. +
Trans. Acad. Sci. St. Louis +
cespitose +  and solitary +
fragmented +
200 cm2,000 mm <br />2 m <br /> (400 cm4,000 mm <br />4 m <br />) +
globose +, obovoid +  and flattened +
Illustrated +
semiwoody +
long-exserted +
branched +, , +  and unbranched +
aboveground +
3 +  and 1 +
papillate +
exserted +  and included +
subulate +
Agave orcuttiana +  and Agave pachyacantha +
Agave shawii var. shawii +
Agave shawii +
variety +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
erect +  and decumbent +
2 cm20 mm <br />0.02 m <br /> (?) +
1.2 cm12 mm <br />0.012 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
15mm;22mm +
polycarpic +  and monocarpic +
small;gigantic +
petal-like +