These are facilities wherein seeds are kept under cold and dry conditions. This environmental condition prolongs seed viability,  preserving the plants for future use.  These storage facilities  have been known for its vital role in terms of the conservation of domesticated and wild plant varieties (Shoen & Brown, 2001)

• Its ensures the long-term preservation of crop biodiversity as part of the global strategy for the conservation 
• It provides immediate access to samples, for researchers to access and evaluate for innovation. 
• The variety of plant samples in the seed bank can be the source for medicines, nutrition, and genes. 
• These facilities can provide helpful  scientific information for conserving the remaining natural populations of the species. 
• It can be utilized to   reinstate species into its  suitable habitats where they were once present, or to augment the diversity of small, genetically depleted populations, which can be due to anthropogenic disturbances or inevitable natural disasters.

It is the incapacity of a viable seed to germinate under favorable conditions, at the same time introduces a temporal delay in seed germination process which is also a way  to give more time for seed dispersal over longer geographic distances.   It can also be due to the surrounding structure of the embryo that hinder it from germinating (Bentsink & Koornneef, 2008; Taiz & Ziegler, 2010). 

It is also by the use of  scarification, hot water, dry heat, fire, acid and other chemicals, mulch, and light are the known methods for us to enable the seeds to germinate and grow (Yildiz, 2017). 

This is the type of dormancy wherein the seed coat and other enclosing tissues whether it be the endosperm, pericarp, or extrafloral organs. The embryos that are in this type of dormancy will germinate when water and oxygen are present, and the surrounding tissues are removed or damaged. This type has five basic mechanisms, it prevents water uptake, it induces mechanical constraint, interferes with gas exchange, retains inhibitors, and produces inhibitors. 

This type of dormancy is an intrinsic mechanism since it is not influenced by the seed coat or the surrounding tissues. This can be relieved by amputation of the cotyledons, and this type of dormant is associated with the presence of inhibitors, especially Abscissic acid (ABA), and the absence of growth promoters such as the hormone gibberellic acid (GA). The germination period in breaking this type of dormancy is often associated with a sharp drop in the ratio of ABA to GA.

This type of dormancy is exhibited when seeds that are released from the parent plant are in a dormant state. 

This is exhibited whenever the seeds are released from the parent plant in a non- dormant state, but eventually enter dormancy if the conditions are unfavourable. 

• Woody vines 
• Young branches are glabrous, leaves pinnately, terminal leaflet elliptic or ovate-elliptic, lateral leaflets ovate, oblique and truncate or rounded at base
• Endemic. Philippines: Luzon (Cagayan, Bataan, Cavite, Laguna, Quezon, Sorsogon), Mindoro and Catanduanes.

• Shrubs or small trees. 
• Leaves lanceolate oblong or somewhat falcate, margins crenate, rug ulose, bluntly acuminate
•  Endemic and rare in valley woods of southern Luzon , Philippines; in Mt. Makiling, Luzon, at 1 0-300 m altitude
  
  

• Shrubs with small branches.
• Leaves ovate to oblong or smaller ones elliptic, glabrous, pale green beneath
• Flowers yellowish, in axillary glomerulus, glabrous; pedicels sub flexuous,
• Endemic, in forests at low and medium altitudes, northern Luzon to Mindanao (Davao), Philippines; in Mt. Makiling, Luzon, at 200-500 m altitude. 
  
  

• Trees with spreading crowns. 
• Leaves oblong, glabrous, pale green or whitish beneath
•  Flowers solitary, staminate upon slender, 2-cm long pedicels, pistillate subsessile
• Endemic, Luzon to the Visayan islands, Philippines, in dry woods of the cogan regions: in Mt. Makiling, Luzon, in open.
  
  

• Trees medium-sized to large.
• Leaves oblong to broadly lanceolate
• Staminate flowers glabrous, fasciculate; pedicels 5-8 mm long; sepals 4, ovately elliptic
• Fruits lemon-yellow
• Endemic. Throughout the Philippines, in primary forests, ascending to 700 m; in Mt. Makiling, Luzon, at 2 00-550 m altitude. 
  
  

• Trees. 
• Leaves ovately elliptic to broadly oblong,
• Flowers sol itary or in b ranched , terminal spikes
• Endemic in the Philippines, in forests at low and medium altitudes; in Mt. Makiling, Luzon, at 50-500 m. 
  
  

• Shrubs or small trees. 
• Branches densely brown-pubescent. Leaves ovately lanceolate or broadly oblong
• Pistillate flowers subsessile; calyx lobes, strongly ciliate; stigmas terminal, forked; styles short, distinct.
•  Endemic, in dry woods at low altitudes throughout Luzon to northern Mindanao, Philippines; in Mt. Makiling, Luzon , at low altitudes in open, dry areas. 

• Trees
• Leaves ovately elliptic to oblong, glabrous, short-acuminate, base acute
• Inflorescences axillary, in spicate or paniculate racemes.
• Endemic. Throughout the Philippines, in forests at low altitudes; in Mt. Makiling, Luzon, at 30 to 300 m. Com. name - 
  
  

• Trees
• Leaves oblong, often smaller, with 9 pairs of obscure nerves, pale beneath , glabrous, entire, acute, base broadly obtuse
• Endemic. Luzon to the Visayan islands, Philippines, in primary forests at low and medium altitudes; in Mt. Makiling, Luzon. at 1 00-500 m altitude. 
  
  

• Trees
• Leaves broadly ovate to suborbicular, soft-pubescent on nether side. base deeply cordate or broadly rounded when peltate
• Inflorescences axillary, nearly as long as petioles, densely pubescent; staminate flowers densely clustered along short, paniculate branches, whitish; calyx 
• Fruits ovoid. 1 em thick. glabrous, stipitate, crowned by stigma and subtended by calyx, fleshy
  
  
• Endemic in the Philippines; in low forests in most parts of the country; in Mt. Makiling, Luzon, in light forest and forest borders from 30 m to about 250 m.