34 RUTACE^. (OEANGE 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. moschatum, L'Her. (Musky Filaeia.) 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. & Am. Leaves reniform-cordate, 1 to 3 inches 

 broad; sepals broad, 5 to 6 lines long. 



3. LIMNANTHES, U. Br. 



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

 nual low diS'use herbs, with pungent juice, -growing in wet places; leaves pinnate, 

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



1. L. Douglasii, E. 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. comiculata, L. (Yellow Sorrel. ) Distinguished by its slender branching 

 stems, and smaller yellow flowers. 



Order 16. RUTACEiE. 



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 



