MONOCOTYL EDONS. 



5-15 



Lilium hulbiferum are, on the other hand, normal axillary shoots, and probably 

 the same is the case with those on the inflorescence of some species of Allium. 

 Adventitious buds are stated by Hofmeister to occur on the roots of Epipactis 

 inicrophylla. 



The Leaves of Monocotyledons are seldom verticillate, though this occurs in 

 the foliage-leaves of Elodea and the bracts of Aiisma; they are very commonly 

 arranged alternately in two rows, as in Gramineae, Irideoe, Phormium, Clivia, Typha' 



Fig. 391.— The underground part of a floweringr plant of Colchictim autiottnale : A seen in fiout and from without, k 

 the corni, s' , x"^ataphyllary leaves embracing the flower-stalk, luh its base from which proceed the roots w ; B longitudinal 

 section, A A a brown skin which envelopes all the underground parts of the plant, st the flower- and leaf-stalk of the 

 previous year which has died down, its swollen basal portion k only remaining as a reservoir of food-materials for the 

 new plant now m flower. The new plant is a lateral shoot from the base of the corm k, consisting of the axis from the base 

 of which proceed the roots -wt, and the middle part of which (/&') swells up in the next year into a corm, the old conn k 

 disappearing ; the axis bears the sheath-leaves s, s', s'' and the foliage-leaves /', /" ; the flowers l>,b' are placed in the 

 axils of the uppermost foliage-leaves, the axis itself terminating amongst the flowers. The foliage-kaves are still 

 small at the time of flowering ; in the next spring they emerge from the ground together with the fruits ; the portion of the 

 axis k then swells up into the new corm, on which the axillary bud k" developes mto the new flowering plant, 

 sheath of the lowermost foliage-leaf is changed into the brown enveloping skin. 



v\n\& the 



&c. This arrangement either prevails over the whole shoot together with its 

 secondary shoots, or occurs only at first, and then passes into spiral arrangements, 

 which very commonly lead to the formation of rosettes radiating on all sides, as 

 in Aloe (see Fig. 144, p. 172), Agave, Palms, &c. The arrangement with the angle 

 of divergence V3 is much rarer, but occurs in some species of Aloe, Carex, Pan- 

 danus, &c. Spiral arrangements Vv'ith a smaller divergence than \ ., also occur 



N n 



