1) In two vertical rows 
organized in two rows
• (a.) Pointing two ways, as leaves that grow only on opposite sides of a branch; in two vertical rows. • (a.) Twofold; arranged in two rows.
in two vertical rows
in two vertical rows
Bi·fa'ri·ous adjective [ Latin bifarius ; bis twice + fari to speak. Confer Greek ... twofold; ... twice + ... to say.] 1. Twofold; arranged in two rows. 2. (Botany) Pointing two ways, as leaves that grow only on opposite sides of a branch; in two vertical...
Arranged in two rows.
bifarious, bifariously 1. A description of plant parts that are arranged in two rows, one on each side of an axis. 2. Pointing two ways, as leaves that grow only on opposite sides of a branch; in two vertical rows. 3. Twofold; arranged in two rows. 4. Growing in two ranks; such as, needle-type leaves growing in two rows on opposite sides of a tw...
arranged in two rows
in two vertical rows.