ORDER 30. GERANIACE^E. 67 



Herbs. Disk annular, 10-lobed. Fruit of 612 indehiscent carpel* ................... TBIBULUS. 1 



Trees. Disk inconspicuous. Fruit of 2 5 dehiscent, 1-seeded carpels 



1. TRIBULUS, L. Sep. and pet. 5, imbricated. Stam. 10, the 5 al- 

 ternate with the petals placed inside of hypogynous glands. Ov. sessile, 

 cells 1-5-seedecl, separating into nutlets. Loosely branched, prostrate 

 herbs, with abruptly pinnate leaves. Flowers solitary (yellow). 



1 T. (Kallstrcemia) maximum L. Lfts. 3 or 4 pairs, oblong or oval, oblique, the ter- 



minal pair largest ; nutlets 10, tubercled, 1-seeded. Ga. Fla. 1 2f. 



2 T. cistoid.es L. Lfts. 5 8 pairs, linear-lanceolate, subequal; ped. elongated, with 



one large flower ; nutlets 5, spiny, 2-5-seeded. Fla. 2f. 



2. GUAIACUM, Plm. LIGNUM- VIT^E. Sep. and pet. 4 or 5, decidu- 

 ous, imbricated. Stam. 8 10. Ovary stipitate, 2-5-celled, cells many-ovuled, 

 in fruit 1-seeded. ^ t> Wood hard and resinous. Lvs. abruptly pinnate 

 Ped. in pairs, between the stipules, 1-flowered. 



G. sanctum L. Branches jointed ; Ifts. 3 or 4 pairs, oblong, oblique, entire, mucro- 

 nate ; ped. short ; pet. obtuse, blue. S. Fla. 20f. Bark white. 



ORDER XXX. GERANIACE^E. GERANIA. 



Herbs or shrubs with perfect, h} r pogynous, symmetrical and regular, or 

 irregular, 3-5-merous flowers. Stamens as many or twice as many as the 

 sepals, often some of them abortive or rudimentary. Carpels as many as 

 the sepals, 1-few-seeded, mostly separating from the persistent axis at ma- 

 turity. A large and rather incongruous order, as now constituted (by Ben- 

 tham and Hooker), including the following tribes, heretofore regarded as 

 orders. Figs. 27, 28, 172, 243, 265, 270. 315,- 350, 497. 



f Flowers regular. a Styles 5, Carpels several-seeded. TRIBE I. 



a Style 1. b Sepals valvate. Fruit beakless. TKIBE II. 



b Sepals imbricate. Fruit beaked. TRIBE III. 

 Flowers irregular. c Petals perigynous. Stamens 7 or 8. TRIBE IV. 



c Petals hypogynous. Stamens 5. short. TRIBE V. 

 I. OXALIDE.E. Symmetrical. Stamens 10 +. Petals convolute. Pod 5-celled ..... OXALIS. 1 



IL LIMNANTHE^:. Symmetrical. Stamens (10 in LIMNANTHKS, No. 3) 6 in ........ FIXXRKBA. $ 



III. GERANIE^E. Stamens 10 + . 5 often sterile. Glands between the petals. Fruit a regma. .() 



e Stamens 10. all antheriferous. Tail of carpels beardless ............... ,, 4 ..... GKRA.ninM. b 



e Stamens 5 antheriferous. Tail of the carpels bearded .......................... ERODIUU. 4 



FV. PELARGONIEjE. Sepals spurred behind. Glands 0. Stamens declined. .(/) 



/ Spur adnate to the pedicel. Fruit rostrate, a regma ........................... PELARGONIUM. 5 



/ Spur free. Fruit not beaked. Carpels 1-seeded, separating .................... TROP.*OLUII. 6 



V. BALSAMINE.E. Sepals spurred behind. Pod opening elastically ............... IMPATIKNS. 7 



1. OXALIS, L. WOOD SORREL. ('O|us, acid: the herbage is sour.) 

 Sep. 5, distinct or united at base. Pet. contorted, much longer than the 

 calyx. Sty. 5, capitate. Caps, oblong or subglobous. Carp. 5, 1 to seve- 

 ral-seeded. Mostly u, with palmately trifoliate leaves and inversely 

 Iteart-shaped leaflets. Figs. 265, 270, 497. (See Addenda.) 

 1 O. Acetosella L. Acaulescent ; scape longer than the leaves, 1-flowered; leaflets 

 broad-obcordate with rounded lobes ; styles as long as the inner stamens ; root doo 

 tate. scaly, u Woods, Can. and N. States. &. Flowers white-purple. June. 



