34 RUTACE^S. (ORANGE FAMILY.) 



decumbent; leaves pinnate the leaflets laciniately pinnatifid with narrow acute lobes, 

 the opposite leaves unequal; the long peduncles in the axils of the smaller leaves bearing 

 4' to 8-flowered umbels; the slender pedicels at length reflexed, the fruit still erect; the 

 bearded carpels with spirally twisted tails. 



2. E. mo3chatum, L'Her. (MUSKY FILARIA.) Similar to the last but of a lighter 

 green and the leaflets unequally and doubly serrate, not pinnatifid. Gives out a musky 

 odor when wilted. 



3. E. macrophyllum, Hook. & Arn. Leaves reniform-cordate, 1 to 3 inches 

 broad; sepals broad, 5 to C lines long. 



3. LIMNANTHES, E. Br. 



Glands 5, alternating with the petals. Stamens 10. Style 5-cleft at the apex. An- 

 nual low diffuse herbs, with pungent juice, growing in wet places; leaves pinnate, 

 without stipules; flowers yellowish-white or rose-colored, solitary 011 axillary peduncles. 



1. L. Douglas!!, R. Br. Glabrous, yellowish green, weak and succulent stems; 

 leaflets incisely lobed; peduncles at length 2 to 4 inches long; sepals lanceolate, 3 to 4 

 lines long, half the length of the oblong or obovate, emarginate or truncate petals. 



Var alba, Hartweg. Villous sepals; shorter, white petals. 



4. OXALIS, L. 



The parts of the flower in fives. Stamens 10; the filaments dilated and united below. 

 Capsule columnar or ovoid, beaked with the short style. Low herbs with sour watery 

 juice; leaves alternate or radical, digitately trifoliolate, leaflets obcordate. 



1. O. Oregana, Nutt. (REDWOOD SORREL.) Acaulescent, rusty- villous; rootstock 

 creeping; leaflets broadly obcordate, 1 to 1^ inches broad; petioles 2 to 8 inches long; 

 scapes equaling or exceeding the leaves, mostly 1-flowered; petals 6 to 12 lines long, white 

 or rose-colored, often veined with purple. 



2. O. corniculata, L. (YELLOW SORREL.) Distinguished by its slender branching 

 stems, and smaller yellow flowers. 



ORDER 16. RUTACEJE. 



Pellucid or glandular-dotted aromatic leaves, along with definite hypogynous stamens 

 and definite seeds characterize this order, although some of the orange-tribe have many 

 stamens. 



1. PTELEA, L. HOP-TREE. 

 Flowers polygamous. Sepals, petals and stamens 4 or 5; ovary with a short, thick 



