184 ROSE ORDER 



(2) Flowers 12-18 mm. long 



(a) Banner hairy L. sericeus 



(b) Banner smooth or nearly so 



x. Leaflets 2-5 in. long, smooth or finely 



hairy L. Burkei 



y. Leaflets 1-2 in. long, more or less silky L. ornatus 



Medicago Linne 1753 Alfalfa, Nonesuch 



(Gr. medike, alfalfa, Lat. ago, like) 



PI. 28, fig. 2. 



Sepals 5, united, petals 5, yellow or purple, stamens 10, 9 united, ovary 

 1 -several-seeded, pod curved or spirally twisted, netted or spiny, remaining 

 closed, 1-few-seeded ; flowers in axillary heads or racemes; leaves alternate, 

 of 3 toothed leaflets ; annual or perennial. 



1. Flowers blue-purple, 5-7 mm. long; pods with 2- 



3 spirals M. sativa 



2. Flowers yellow, 2-3 mm. long; pods with a partial 



spiral M. lupulina 



Melilotus Linne 1753 Sweet Clover 



(Gr. mel, honey, lotus, a plant, from its fragrance) 



PL 29, fig. 9. 



Sepals 5, united, petals 5, white or yellow, stamens 10, 9 united, ovary 

 with few ovules, pod usually remaining closed, with 1 -few seeds; flowers 

 in racemes ; leaves of 3 toothed leaflets ; annual or biennial. 



1. Flowers white, standard larger than wings M. alba 



2. Flowers yellow, standard and wings equal M. officinalis 



Petalostemon Michaux 1803 Prairie Clover 



(Gr. petalon, petal, stemon, stamen, the two grown together) 



(Kuhnistera Lamarck) 



PL 27, fig. 3. 



Sepals 5, united into a bell-shaped calyx with nearly equal teeth, petals 

 5, white to pink or purple, on long slender claws, standard large, wings and 

 keel petals similar, their claws grown to the stamen-tube,, stamens 5, ovary 

 sessile, 2-ovuled ; pod enclosed in the calyx, 1-2-seeded; flowers curiously 

 irregular, not pea-like, in dense spikes or heads ; leaves alternate, odd-pin- 

 nate, dotted with glands; perennial. 



