NEW PLANTS FROM NORTH DAKOTA 141 



New Plants from North Dakota.— XI. 



BY J. LUNELL. 



Antennaria angustiarum sp. nov. 



Planta in coloniis parvis, marium et feminanim in vicem 

 vicinis, genita. Stolones longitudinem caulis dimidiam obtinentes. 

 Plantae stamineae et pistillatae longitudine aequales, 10-12 cm. 

 altae, femineae lente aliquantulum elongatae. Caulis infimus 

 foliis 4-7 lanceolatis, superiorum proximis minoribus verticillatim 

 cinctus. Folia basilaria tomento laneo subtili, remisso et radendo 

 facile amoto, post pluvias fere pellucido et sub lente tantum 

 percepto, superne vestita. Simul folia stolonum radicantium 

 tomento aeque appresso-sericeo, per annum primum manente, 

 gaudent. Folia basilaria 2-3 cm. longa, 8-12 mm. lata, late ob- 

 lanceolata vel elliptica, basi cuneata, petiolo alato sensim angus- 

 tato, textura tenui sed firma. Mas capitula pauca, plerumque 

 3-4, dense congesta habet, femina capitula 2-5, primum cumu- 

 lata, postea corymbosa, pedicellis longitudine varia brevibus 

 ornata. Involucra 8 mm. alta. Bracteae maris albae, latae, 

 obtusae, integrae, feminae albae, externis macula fusca addita, 

 angustae, acutae, integrae. 



Plant growing in small colonies, males and females near 

 each other. Stolons about one-half the length of the stem. Mature 

 staminate and pistillate plants of equal length, 10-12 cm. high, 

 the pistillate becoming somewhat longer in the late fruiting stage. 

 The lowest end of the stem encircled by a rosette of 4-7 lanceolate 

 leaves, smaller than the leaves next above them on the stem. 

 Primary basal leaves carry on the upper side a thin, woolly tomen- 

 tum, loose and easily removed by scratching, after rains looking 

 almost transparent, and then almost needing the lens to become 

 visible. At the same time the leaves on the rooting stolons have 

 an equally appressed silky tomentum which they retain during 

 the whole first season. Basal leaves 2-3 cm. long, 8-12 mm. 

 wide, broadly oblanceolate or elliptic, with a cuneate base gradually 

 narrowed into the winged petiole, their texture being thin, but 

 firm. The male plant has a dense cluster of few, generally 3 or 

 4 heads, the female plant has 2-5 heads, at first clustered, later 

 corymbose with short pedicels of variable length. Involucres 8 



