I'HA.XKKOliAMIA 



607 



borne in terminal racemes and have a large vexillum, the other petals remaining 

 narrow and inconspicuous. The stamens are only coherent at the base, and bear 

 conspicuous, reddish -yellow anthers (Fig. 640). The fruit is very peculiar. The 

 ovary has along stalk and hears two ovules near the tip. One of these develops 

 into the seed of the indehiscent, compressed pod, which has a broad wing 

 along the ventral suture and a narrower wing along the dorsal suture (Fig. 641). 

 The bell-shaped calyx persists 

 on the stalk. 3. Gcnistcac. 

 All ten stamens are coherent 

 (Fig. 637 B). Leaves pinnate 

 or simple, margin entire. Genista, 

 Sarotliamnus, Lupin us, Cytisus 

 (Fig. 642). The Laburnum 

 ( Cytisus Laburnum) is one of the 

 commonest ornamental trees of 

 our gardens and grows wild in 

 the Alps. It has tripinimtf 

 leaves and long pendulous 

 racemes of yellow flowers. C. 

 Adami, which is found occasion- 

 ally in gardens, was supposed to 

 have arisen by the grafting of 

 C. jiurjiurcus on C. Lului-raitm. 

 The racemes and Mowers of one 

 and the same individual sonic- 

 times resemble the former and 

 sometimes the latter ancestral 

 form (Fig. 247). The inter- 

 mediate form is however sterile, 

 and probably corresponds to an 

 ordinary hybrid grafted on C. 

 Laburnum. Ulcx, Furxc, a char- 

 acteristic British plant. Spar- 

 > in in, distributed in the Mediter- 

 ranean region. 4. Trifolieae. 

 Leaves trifoliate, serrate. 

 Flowers aggregated in heads or 

 in spikes or umbels. Stamens 

 (9) + 1. Indehiscent fruits. 

 TrifiiiittiH, Clover, with persist- 

 ent calyx and corolla. Metlicago, 

 Medick, with deciduous corolla ; 

 fruit sickle-shaped or spirally 

 twisted. Mililotus, Melilot, 

 with racemose inflorescences. Trigonclla. Ononis, Rest-Harrow. The increase 

 in the amount of nitrogen in the soil effected by the root-tubercles (cf. p. 232, 

 Fig. 204) of Legumiuosae iinds its practical application in European agriculture 

 in the cultivation of species of TrifoUu'm, Afeilicayo, and Lupinus. 5. Lotcac. 

 Lotus, Bird's-foot Trefoil (Fig. 638). Leaves imparipinnate, lowest pair of 

 leaflets owing to the absence of the petiole resembling stipules. Anthyllis, 

 Kidney-Vetch. Tctrayonolobus. 6. Galeyeae or Astragaleae. Leaves impari- 



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