238 A FLORA OF MANILA 
ovuled. Pod of several, rounded, flattened, finely prickly, indehiscent, 
1-seeded joints. (In honor of J. Zorn, an early German physician and 
botanist. ) 
Species 10, all of tropical America, except 2; 1, probably introduced, 
in the Philippines. 
1. Z. DIPHYLLA (L.) Pers. 
Glabrous, the stems slender, wiry, branched, spreading or ascending from - 
the rather stout root, up to 40 cm in length. Leaflets 2, lanceolate, acute 
or acuminate, 1 to 2.5 cm long; stipules lanceolate, produced below the 
point of insertion. Racemes 2 to 6 cm long, slender, 3- to 15-flowered. 
Flowers small, yellow, quite hidden by the paired, lanceolate, acuminate, 
persistent bracts which are 8 to 10 mm long and tailed at the base. Pod 
of 2 to 6, round, prickly joints about 2 mm wide. 
In open dry grass lands, San Pedro Macati, fil. Nov.—Jan.; of local 
occurrence in the Philippines, probably introduced. Most tropical countries, 
possibly originating in tropical America. 
23. DESMODIUM Desvaux 
Herbs, shrubs, or small trees with simple or 3-foliolate stipulate leaves. 
Flowers small, white, pink, red, or purplish, in few- to many-flowered 
axillary or terminal racemes or umbels, sometimes panicled. Calyx-teeth 
longer or shorter than the tube, the upper two often subconnate. Corolla 
exserted; standard broad; wings more or less adhering to the usually 
obtuse keel. Upper stamen free or partly so, the other 9 united. Ovary 
few- to many-ovuled. Pod usually composed of few to many, 1-seeded, 
indehiscent, compressed joints, smooth or covered with minute hooked hairs. 
(Greek “bond” or “chain,” allusion to the jointed pods.) 
Species 130 or more, in all tropical countries, a few in PeeEe regions, 
30 in the Philippines. 
1. Leaves 3-foliolate. 
2. Bracts large, orbicular, persistent, leaf-like, enclosing and concealing 
the flowere/(. 0.4. Oe, pee, boa 2 1. D. pulchellum 
2. Bracts very small or none. 
3. Flowers umbellate, umbels arranged in terminal or axillary pani- 
eles >,erect Bhrubs Aint. etic tl. tele ce 2. D. quinquepetalum 
3. Flowers not umbellate; herbs or undershrubs. 
4. Pods not sinuate, the segments much longer than broad. 
3. D. scorpiurus 
4, Pods deeply sinuate, spirally twisted, the segments as broad 
os JONG) 22.2535.) 5 eee eae tel eae te, pe 4. D. procumbens 
4, Pods not deeply sinuate nor spirally twisted. 
5. Prostrate or spreading, suffrutescent; leaves silvery-pubescent 
beneath; flowers numerous...............--..--0----------- 5. D. capitatum 
5. Slender spreading herbs with 1 to 3 flowers in the leaf-axils. 
6. Pedicels usually shorter than the petioles; leaflets obovate- 
cuneate, truncate or emarginate; branches nearly glabrous. 
6. D. triflorum 
6. Pedicels longer than the petioles; leaflets usually oblong, 
rounded at the apex; branches pubescent with spreading 
) 1 | Ne MSL yo SMR EM Neplots ee Bld 7. D. heterophylla 
1. Leaves 1-foliolate. 
