A Grammatical Dictionary of Botanical Latin

diadelphous (stamens): “consisting of two parcels of stamens or fraternities” (Lindley); “combined in two often unequal sets” (Fernald 1950); “united by the filaments into two bundles or fascicles, as in Dutchman’s-breeches (Bikukulla) and most Fabaceae; -said of stamens” (Webster’s Intnl. Dict. 1915);

- stamina definita, libera v. diadelpha (B&H), stamens separate, free or [combined in two sets].

- stamina 10, monadelpha, rarius diadelpha. (B&H), stamens 10, monadelphous [i.e. united into a tube or column], more rarely [combined in two sets].

- stamina 10, diadelpha v. si monadelpha stamen vexillare saepius ima basi liberum. (B&H), stamens 10, [combined in two sets], or, if [united by their filaments into a tube] the banner stamen at the lowest base free.

- stamina diadelpha, antheris 5 majoribus linearibus, reliquis ovatis.(B&H), stamens diadelphous [combined in two sets], with 5 anthers larger, linear, with the remaining ovate.

- genus saepe e staminibus monadelphis v. diadelphis v. e stylo barbato v. nudo dividitur (B&H), a genus often divided by the stamens [being] monadelphous [united by the filaments into a tube], or diadelphous [combined in two sets], or by the style bearded or naked,

- stamina omnia in vaginam supra fissam connata v. vexillare solutum, v. vagina etiam infra fissa asqualiter diadelpha; antherae versatiles (B&H), all of the stamens fused into a sheath separated above or the vexillar [stamen] not adherent, or the sheath also separated below evenly diadelphous; the anthers versatile.

- stamina oo, v. in Fumarieis definita diadelpha v. petalis opposita (B&H), the stamens [indefinite], or in Fumarieae definite, diadelphous or opposite to the petals.

- stamina ab auctoribus oo-adelpha dicuntur, the stamens by authors are said to be [indeterminately]-[in combined sets]

- stamina definita in Pachynemate et Adrastaea, pauca in Hìbbertiis nonnullis, alte 5-adelpha in Candollea, perigyna in Crossosomate (B&H), the stamens determinate in Pachynema and Adrastaea, few in some Hibbertiae, tall 5-adelphous in Candolea, perigynous [i.e. around the ovary] in Crossosoma.

NOTE: Diadelphia, said to be a plural noun, “A disused Linnaean class of plants. It comprises those in which the stamens are united by their filaments into two bundles” (Webster’s Intnl. Dict. 1915).