The Amaryllis Manual
Hamilton Traub - 1958

KEY TO THE SUBGENERA AND SPECIES OF THE GENUS AMARYLLIS L.

1a. Seeds numerous, discoid to flattish D-shaped:

2b. Tepaltube short or very short, usually less than 3 cm. long, rarely up to 4.2 cm. long:


Subgenus II. LAIS (Salisb.) Baker (THE STRIATA GROUP)

7b. Stigma triangularly 3-lobed (capitate), except sometimes shortly trifid with thick forks in A. evansiae (24b, below). (subg. type: A. Belladonna L.):
Subgenus III. AMARYLLIS (THE BELLADONNA GROUP) 1b. Seeds 1 or 2 or a few in each locule, round, or rounded with flattish sides, black or dark brown (subg. type: A. reticulata L'Herit.):

Subgenus V. SEALYANA Traub (THE RETICULATA GROUP)