Ciao,
queste sono le descrizioni "ufficiali":
Manfreda maculata (Mart.) Rose (1903) [sinonimi: Polianthes maculata Mart. (1829); Agave stictata Thiede & Eggli (1999)]:
Basal leaves (in herbarium specimens) 4, somewhat lanceolate, narrowed at base, acuminate, 2.5 cm. or more wide at widest point, 3 dm. long, dull green, with large brown spots, pubescent on both sides, paler beneath; stem, including inflorescence, less than a meter high; stem leaves 3 or 4, bractlike; flowers rather few, the lower ones 2.5 cm. apart, sessile or nearly so, subtended by a narrow bract; perianth tubes 12 to 16 mm. long, purplish; perianfh lobes somewhat shorter; stamens much exserted; capsule oblong, 2 cm. long, smooth.
Manfreda macu.losa (Hook.) Rose (1903) [sinonimi: Agave maculata Regel (1856); Agave macu.losa Hook. (1859); Polianthes macu.losa (Hook.) Shinners (1966)]:
Basal leaves 6 to 10, blotched with brown or sometimes with green, the margins serrulate; scape 3 to 6 dm. long, with about small bracts, purplish; flowers 10 to 25, nearly sessile, almost 5 cm. long (including ovary); tube narrowly funnelshaped, a little longer than the purplish or greenish white, somewhat spreading lobes; filaments a little shorter than the perianth lobes; anther cells exserted, brownish; stigmas 3-lobed.