416 PHANEROGAMOUS PLANTS. 



There are several other species of this genus with heteromorphous 

 nutlets, but none in which the difference in form is so great as in 

 this. In our New Mexican specimens the nutlets are often all 

 winged. 



Plate 13, B. Eritrichium pterocaryum : an entire plant. Fig. 1. 

 Flower, enlarged. 2. Corolla, laid open and magnified. 3. Fruit, 

 enlarged. 4. Wingless nutlet; back view. 5. Inside view of the 

 same. 6. One of the winged nutlets, back view. 7. Face of the 

 same. 8. Transverse section of a winged carpel. 9. Axis and style. 

 10. Seed. 11. Embryo. 



4. Eritrichium muriculatum, Alpli. DC. (Tab. 13, A.) 



Eritrichium t muriculatum, Alph. DC. in Prodr. 10, p. 132? 

 Myosotis muricata, Lehm. in Hook. & Arn. Bot. Beech, p. 369 ? 



Hab. Nisqually, Washington Territory. — The fruit of this plant dif- 

 fers from the description of Hooker & Arnott in the nutlets being rather 

 acute, and not densely, but sparsely muriculate. Between the little 

 prominences the surface is scabrous, with exceedingly minute and 

 crowded elevated dots. They are about two-thirds the length of the 

 fructiferous, and are dark gray, mottled with brown. Very often all 

 but one are abortive. Nearly allied to E. angustifolium (Torr. in Pacif. 

 R. Road Expl. 5, p. 363). In that species the stem is branched from 

 the base, the lobes of the calyx are much narrower and longer, con- 

 nivent in fruit ; the fruit extremely minute, and the roughness of the 

 surface only perceptible by the aid of a pretty strong lens. Another 

 allied species is E. pusillum, but that is much smaller, the lobes of 

 the calyx ovate, and but little longer than the fruit ; the nutlets are 

 triangular-ovate, and nearly as broad at the base as they are long, 

 somewhat acuminate, roughened with conspicuous little white warts 

 on the gibbous back, incurved or hollowed on the face. The four 

 nutlets are closely approximated into a depressed, somewhat quad- 

 rangular fruit. 



